a: =>5-x=-23

=>x=5+23=28

b: =>x-3-x+7-25+x=54

=>x-21=54

=>x=75

c: =>7-9x-2x+4=-5x-35+27-25=-5x-37

=>-11x+3=-5x-37

=>-6x=-40

=>x=20/3

a) \(10-x-5=\left(-5\right)-7-11\)

\(\Rightarrow5-x=-23\)

\(\Rightarrow x=5+23\)

\(\Rightarrow x=28\)

b) \(\left(x-3\right)-\left(x+17-24\right)-\left(25-x\right)=24-\left(-30\right)\)

\(\Rightarrow x-3-x-17+24-25+x=54\)

\(\Rightarrow x-21=54\)

\(\Rightarrow x=54+21\)

\(\Rightarrow x=75\)

c) \(\left(7-9x\right)-\left(2x-4\right)=-\left(5x+35\right)-\left(-27\right)-25\)

\(\Rightarrow7-9x-2x+4=-5x-35+27-25\)

\(\Rightarrow11-11x=-5x-33\)

\(\Rightarrow-11x+5x=-33-11\)

\(\Rightarrow-6x=-22\)

\(\Rightarrow x=\dfrac{22}{6}=\dfrac{11}{3}\)

a. 
10-x-5 = (-5) - 7 -11
=>5-x = 0
=>x=5
b
(x-3) - (x+17-24) - (25-x) = 24 - (-30)
=>x - 3 - x - 17 + 24 - 25 - x = 24 + 30
=>-x - 21 = 54
=>-x = 75
=>x = -75
c
(7 - 9x) - (2x - 4) = - (5x + 35) - (-27) - 25
=>7-9x - 2x + 4 = -5x - 35 + 27 - 35
=>11 - 11x + 5x = -43
=>16x = 11 + 43
=>16x = 54
=>x=4

7(x-14)+35=56

7(x-14)=21

x-14=3

x=17

7 . (x-14)+35= 25+279:9

7 . (x-14)+35= 25+31

7 . (x-14)+35= 56

7 . (x-14)= 56-35

7 . (x-14)= 21

x-14= 21:7

x-14= 3

x= 14+3

x= 17

Vậy x = 17

7 . (x - 14 ) + 35 = 25 + 279 :9

7 . (x - 14 ) + 35 = 25 + 31 

7 . (x - 14 ) + 35 = 56

7 . (x - 14 )         = 56 -35

7 . (x - 14 )         = 21

     (x - 14 )         = 21 . 7

     (x - 14 )         = 147

      x                   = 147 + 14

      x                   = 161

 chúc bạn học tốt !

a: 9-25=7-x-(25+7)

=>7-x-25-7=-16

=>-x-25=-16

=>x+25=16

hay x=-9

b: \(10+2\left|x\right|=2\cdot\left(3^2-1\right)\)

\(\Leftrightarrow2\left|x\right|=2\cdot8-10=6\)

=>x=3 hoặc x=-3

c: -6x=18

nên x=18:(-6)=-3

21-(25-X+23)=  -(35-7)

21-25+X-23=   -28

(-4)+X-23 =  -28

(-4)+X=-28+23 

(-4)+X=-5

X=(-5)-(-4)

X=  -1

a,21-(25-X+23)=-(35-7)\(\Rightarrow21-\left(48-\chi\right)=-28\)

\(\Rightarrow48-\chi=21+28\)

\(\Rightarrow48-\chi=49\Rightarrow\chi=-1\)

HTDT

\(21-\left(25-x+23\right)=-\left(35-7\right)\)

\(\Leftrightarrow21-25+x-23=-28\)

\(\Leftrightarrow\left(21-25-23\right)+x=-28\)

\(\Leftrightarrow-27+x=-28\)

\(\Leftrightarrow x=-1\)

Vậy x=-1

7(x-14)+35=25+279/9

7(x-14)+35=25+31

7(x-14)+35=56

7(x-14)=56-35

7(x-14)=21

x-14=21/7

x-14=3

x=3+14

x=17

140 : ( x - 8 ) = 7 

          x - 8   = 140 : 7 = 20

               x   = 20 + 8 

               x   = 28

* 140 : (X-8)=7

X-8=140:7

X-8=20

x=20+8

x=28

Vậy X =28

* 4(X+41)=400

X+41=400:4

X+41=100

X=100-41

X=59

Vậy x=59

*135-5(X+4)135

5(X+4)=135-35

5(X+4)=100

X+4=100:5

X+4=20

X=20-4

X=16

Vậy X = 16

b. -6x=18

=> x = 18 : (-6)

=> x = -3

c. 35-3.|x|=5.(2³-4)

=> 35-3.|x|=5.(8-4)

=> 35-3.|x|=5.4

=> 35-3.|x|=20

=> 3.|x|=35-20

=> 3.|x|=15

=> |x|=5

=> x \(\in\){-5; 5}

d. => 10+2.|x|=2.(9-1)

=> 10+2.|x|=2.8

=> 10+2.|x|=16

=> 2.|x|=16-10

=> 2.|x|=6

=> |x|=3

=> x \(\in\){-3; 3}

a. 9 - 25 = ( 7 - x ) - ( 25 + 7 )

=> -16 = 7 - x - 32

=> x = 7 - 32 + 16

=> x = -9.

9-25=(7-x)-(25+7)
9-25=7-x-25-7
=> 9-25-7+25+7=-x
=> x=-9