a)  8x-75=5x+21

     8x-5x=21+75

      3x=96:3

        x=32

b)     9x+25=-(2x-58)

         9x+25=-2x+58

         9x+2x=58-25

           11x=33

              x=33:11

               x=3

tick mình nha

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a, 8x-5x=21+75

=>3x=96

=>x=32

b, 9x+25=-2x+58

=>9x+2x=58-25

=>11x=33

=>x=3

a) 8x - 75 = 5x +21

  8x - 5x = 21 + 75

 3x = 96

x =32

b) 9x + 25 = -2x + 58

   9x + 2x = 58 - 25

  11x = 33

  x =3

a) 8x - 75 = 5x + 21

8x - 5x = 21 + 75

3x = 96

x = 96 : 3 = 32

b) 9x + 25 = - ( 2x - 58 )

9x + 25 = -2x + 58

9x + 2x = 58 - 25

11x = 33

x = 33 : 11 = 3

a, 8x-75=5x+21

8x-5x=21+75

3x=96

x=32

b,9x+25=-(2x-58)

9x+25=-2x+58

9x+2x=58-25

11x=33

x=3

a) |2x-1|=|-7|

<=>|2x-1|=7

<=>\(\left[\begin{matrix}2x-1=7\\-\left(2x-1\right)=7\end{matrix}\right.\)

<=>\(\left[\begin{matrix}x=4\\x=-3\end{matrix}\right.\)

Vậy: x=-3 hoặc x=4

b) |x+5|=0

<=>x+5=0

<=>x=-5

Vậy: x=-5

c) 8x-75=5x+21

<=>8x-5x=21+75

<=>3x=96

<=>x=32

Vậy: x=32

\(8x-75=5x+21\)

\(8x-5x=75+21\)

\(3x=96\)

\(x=32\)

Vậy \(x=32.\)

\(9x+25=-\left(2x-58\right)\)

\(9x+25=-2x+58\)

\(9x+2x=-25+58\)

\(11x=33\)

\(x=3\)

Vậy \(x=3.\)

\(15-\left|2x-1\right|=-8\)

\(\left|2x-1\right|=23\)

\(\Rightarrow\orbr{\begin{cases}2x-1=23\\2x-1=-23\end{cases}\Rightarrow}\orbr{\begin{cases}2x=24\\2x=-22\end{cases}}\Rightarrow\orbr{\begin{cases}x=12\\x=-11\end{cases}}\)

Vậy \(x\in\left\{12;-11\right\}\)

8x-5x=75+21

3x=96

x=32

9x+25=-2x+58

9x+2x=58-25

11x=33

x=3

\(a,8x-75=5x+21\)

    \(8x-5x=21+75\)

               \(3x=96\)

                  \(x=32\)

\(b,9x+25=-\left(2x-58\right)\)

    \(9x+25=-2x+58\)

    \(9x+2x=58-25\)

            \(11x=33\)

                 \(x=3\)

\(c,\left(5-x\right).\left(x+2\right)=0\)

\(\Rightarrow\orbr{\begin{cases}5-x=0\\x+2=0\end{cases}\Rightarrow\orbr{\begin{cases}x=5\\x=-2\end{cases}}}\)

a) \(8x-75=5x+21\)

\(8x-5x=21+75\)

\(3x=96\)

\(x=32\)

vậy \(x=32\)

b) \(9x+25=-\left(2x-58\right)\)

\(9x+25=-2x+58\)

\(9x+2x=58-25\)

\(11x=33\)

\(x=3\)

vậy \(x=3\)

c) \(\left(5-x\right)\left(x+2\right)=0\)

\(\Rightarrow\orbr{\begin{cases}5-x=0\\x+2=0\end{cases}}\Rightarrow\orbr{\begin{cases}x=5\\x=-2\end{cases}}\)

vậy....

d) \(3.\left|x+3\right|-4=-7-\left(-18\right)\)

\(3.\left|x+3\right|-4=-7+18\)

\(3.\left|x+3\right|=11+4\)

\(3.\left|x+3\right|=15\)

\(\left|x+3\right|=5\)

\(\Rightarrow\orbr{\begin{cases}x+3=5\\x+3=-5\end{cases}}\Rightarrow\orbr{\begin{cases}x=2\\x=-8\end{cases}}\)

vậy..

Mình không viết lại đề nhé!

a) 27 - x + 15 + x = x + 2

-x + x - x = 2 - 15 - 27

-x = -40

x = 40

b) 8x - 75 = 5x +21

8x - 5x = 21 + 75

3x = 96

x = 32

c) 15 - |2x - 1| = |-8|

15 - 2x + 1 = 8

-2x = 8 -1 -15

-2x = -8

x = 4 

d) 9x + 25 = -(2x - 58)

9x + 25 = -2x + 58

9x +2x = 58 - 25

7x = 33

x = 33/7

a, \(\left|x-3\right|-16=-4\Leftrightarrow\left|x-3\right|=12\)

\(\Leftrightarrow\orbr{\begin{cases}x-3=12\\x-3=-12\end{cases}\Leftrightarrow\orbr{\begin{cases}x=15\\x=-9\end{cases}}}\)

b, \(26-\left|x+9\right|=-13\Leftrightarrow\left|x+9\right|=39\)

\(\Leftrightarrow\orbr{\begin{cases}x+9=39\\x+9=-39\end{cases}\Leftrightarrow\orbr{\begin{cases}x=30\\x=-48\end{cases}}}\)

f, \(9x+25=-\left(2x-58\right)\Leftrightarrow9x+25=-2x+58\)

\(\Leftrightarrow11x-33=0\Leftrightarrow x=3\)

Làm nốt nhé ! 

a. \(\left|x-3\right|-16=-4\)

\(\Rightarrow\left|x-3\right|=12\)

\(\Rightarrow\orbr{\begin{cases}x-3=12\\x-3=-12\end{cases}}\)

\(\Rightarrow\orbr{\begin{cases}x=15\\x=-9\end{cases}}\)

b. \(26-\left|x+9\right|=-13\)

\(\Rightarrow\left|x+9\right|=39\)

\(\Rightarrow\orbr{\begin{cases}x+9=39\\x+9=-39\end{cases}}\)

\(\Rightarrow\orbr{\begin{cases}x=30\\x=-48\end{cases}}\)

c. \(5-\left(10-x\right)=7\)

\(\Rightarrow10-x=-2\)

\(\Rightarrow x=12\)

d. \(11+\left(15-x\right)=1\)

\(\Rightarrow15-x=-10\)

\(\Rightarrow x=25\)

e. \(8x-75=5x+21\)

\(\Rightarrow8x-5x=75+21\)

\(\Rightarrow3x=96\)

\(\Rightarrow x=32\)

f. \(9x+25=-\left(2x-58\right)\)

\(\Rightarrow9x+25=-2x+58\)

\(\Rightarrow9x+2x=58-25\)

\(\Rightarrow11x=33\)

\(\Rightarrow x=3\)

g. \(\left|x+3\right|=4\)

\(\Rightarrow\orbr{\begin{cases}x+3=4\\x+3=-4\end{cases}}\)

\(\Rightarrow\orbr{\begin{cases}x=1\\x=-7\end{cases}}\)

h. \(15-\left|2x-1\right|=\left|-8\right|\)

\(\Rightarrow15-\left|2x-1\right|=8\)

\(\Rightarrow\left|2x-1\right|=7\)

\(\Rightarrow\orbr{\begin{cases}2x-1=7\\2x-1=-7\end{cases}}\)

\(\Rightarrow\orbr{\begin{cases}x=4\\x=-4\end{cases}}\)

a,\(|x-3|-16=-4\)

\(< =>|x-3|=-4+16\)

\(< =>|x-3|=12\)

\(< =>\orbr{\begin{cases}x-3=12\\x-3=-12\end{cases}< =>\orbr{\begin{cases}x=15\\x=-9\end{cases}}}\)

b, \(26-|x+9|=-13\)

\(< =>-|x+9|=-13-26\)

\(< =>|x+9|=39\)

\(< =>\orbr{\begin{cases}x+9=39\\x+9=-39\end{cases}< =>\orbr{\begin{cases}x=30\\x=-48\end{cases}}}\)

c, \(5-\left(10-x\right)=7\)

\(< =>5-10+x=7\)

\(< =>x=7+10-5=12\)

d, \(11+\left(15-x\right)=1\)

\(< =>11+15-x=1\)

\(< =>26-1=25=x\)

a ) | 2x - 1 | = | -7 |

| 2x - 1 | = 7

+ ) 2x - 1 = 7

2x = 8

x = 4

+ ) 2x - 1 = -7

2x = -6

x = -3

Vậy .........

b ) | x + 5 | = 0

x + 5 = 0

x = -5

Vậy ............

c ) 8x - 75 = 5x + 21

8x - 5x = 21 + 75

3x = 96

x = 32

Vậy .......

d ) 9x + 25 = -2x + 58

9x + 2x = 58 - 25

11x = 33

x = 3

Vậy ........

a, \(\left|2x-1\right|=\left|-7\right|\Rightarrow\left|2x-1\right|=7\)

\(\Rightarrow2x-1\in\left\{-7;7\right\}\)

+) \(2x-1=7\Rightarrow2x=7+1\)

\(\Rightarrow2x=8\Rightarrow x=8\div2=4\)

+) \(2x-1=-7\Rightarrow2x=-7+1\)

\(\Rightarrow2x=-6\Rightarrow x=-6\div2=-3\)

Vậy \(x\in\left\{-3;4\right\}\)

b, \(\left|x+5\right|=0\Rightarrow x+5=0\)

\(\Rightarrow x=0-5\Rightarrow x=-5\)

Vậy x = -5

c, \(8x-75=5x+21\Rightarrow8x-5x=21+75\)

\(\Rightarrow\left(8-5\right)x=96\Rightarrow3x=96\)

\(\Rightarrow x=96\div3\Rightarrow x=32\)

Vậy x = 32

d, \(9x+25=-\left(2x-58\right)\Rightarrow9x+25=-2x+58\)

\(\Rightarrow9x+2x=58-25\Rightarrow\left(9+2\right)x=33\)

\(\Rightarrow11x=33\Rightarrow x=33\div11\Rightarrow x=3\)

Vậy x = 3