a) -3.(x-5) + 6.(x+2) = 9

-3x + 15 + 6x + 12 = 9

3x + 27 = 9

3x = -18

x = -6

b) 7.(x-9) - 5.(6-x) = -6 + 11.x

7x - 63 - 30 + 5x = - 6 +  11.x

=> 12x - 11x = - 6 + 63 + 30

x = 87

c) 10.(x-7) - 8.(x+5) = 6.(-5) + 24

10x - 70 -8x - 40 = -6

2x - 110 = - 6

2x = 104

x = 52

\(-3\left(x-5\right)+6\left(x+2\right)=9\)

\(\Rightarrow-3x+15+6x+12=9\)

\(\Rightarrow-3x+6x=9-15-12\)

\(\Rightarrow3x=-18\)\(\Rightarrow x=-6\)

\(7\left(x-9\right)-5\left(6-x\right)=-6+11x\)

\(\Rightarrow7x-63-30+5x=-6+11x\)

\(\Rightarrow7x+5x-11x=-6+63+30\)

\(\Rightarrow x=-6+63+30=87\)

nhiều quá :((

\(a,2\left(x-5\right)-3\left(x+7\right)=14\)

\(2x-10-3x-21=14\)

\(-x-31=14\)

\(-x=45\)

\(x=45\)

\(b,5\left(x-6\right)-2\left(x+3\right)=12\)

\(5x-30-2x-6=12\)

\(3x-36==12\)

\(3x=48\)

\(x=16\)

\(c,3\left(x-4\right)-\left(8-x\right)=12\)

\(3x-12-8+x=0\)

\(4x-20=0\)

\(4x=20\)

\(x=5\)

Cố nốt nha bn ! 

cảm ơn, bn nha:)))

mà hình như bạn TOP 3 trả lời câu hỏi pải ko nhỉ???

d, \(-7\left(3x-5\right)+2\left(7x-14\right)=28\)

\(\Leftrightarrow-21x+35+14x-28=28\Leftrightarrow-7x=21\Leftrightarrow x=-3\)

e, \(5\left(3-2x\right)+5\left(x-4\right)=6-4x\)

\(\Leftrightarrow15-6x+5x-20=6-4x\Leftrightarrow-5-x=6-4x\)

\(\Leftrightarrow-11+3x=0\Leftrightarrow x=\frac{11}{3}\)

f, \(-5\left(2-x\right)+4\left(x-3\right)=10x-15\)

\(\Leftrightarrow-10+5x+4x-12=10x-15\Leftrightarrow-22+9x=10x-15\)

\(\Leftrightarrow-7-x=0\Leftrightarrow x=-7\)

a)\(\dfrac{x}{60}=-\dfrac{3}{4}\)

\(\Rightarrow x\cdot4=60\cdot\left(-3\right)\)

   \(x\cdot4=-180\)

  x=45

b)\(\dfrac{2}{5}=\dfrac{12}{x}\)

   \(\Rightarrow2x=5\cdot12\)

      \(2x=60\)

       x=30

c)\(x-\dfrac{5}{7}=\dfrac{6}{21}\)

      \(x=\dfrac{2}{7}+\dfrac{5}{7}\)

      x=1

d)\(x+\dfrac{7}{8}=\dfrac{63}{24}\)

     \(x=\dfrac{21}{8}-\dfrac{7}{8}\)

     \(\dfrac{14}{8}\)

a)\(\dfrac{x}{60}=\dfrac{-3}{4}\Rightarrow x=\dfrac{-3.60}{4}=-45\)

b)\(\dfrac{2}{5}=\dfrac{12}{x}\Rightarrow x=\dfrac{5.12}{2}=30\)

a) 2(4x-8)-7(3+x)=|-4|.(3-2)

    8x-16-21-7x=4

    8x-7x=4+16+21

           x=41

Vậy x=41

b) 8(x-|-7|)-6(x-2)=|-8|.6-50

     8x-56-6x+12=8.6-50

     8x-6x=48-50+56-12

          2x=42

            x=42:2

            x=21

Vậy x=21

c) -7(5-x)-2(x-10)=15

    -35+7x-2x+20=15

     7x-2x=15+35-20

          5x=30

            x=30:5

            x=6

Vậy x=6

d) 4(x-1)-3(x-2)=-|-5|

     4x-4-3x+6=-5

     4x-3x=-5+4-6

            x=-7

Vậy x=-7

e) -4(x+1)+(89x-3)=24

    -4x-4+89x-3=24

    -4x+89x=24+4+3

           85x=31

               x=31/85

f) 5(x-30)-2(x+6)=9

    5x-150-2x-12=9

    5x-2x=9+150+12

         3x=171

           x=171:3

           x=57

Vậy x=57

g) -3(x-5)+6(x+2)=9

     -3x+15+6x+12=9

     -3x+6x=9-15-12

            3x=-18

              x=-18:3

              x=-6

Vậy x=-6

h) 7(x-9)-5(6-x)=-6+11x

     7x-63-30+5x=-6+11x

     7x+5x-11x=-6+62+30

                    x=86

Vậy x=86

k) 10(x-7)-8(x+5)=6.(-5)+24

    10x-70-8x-40=-30+24

     10x-8x=-30+24+70+40

            2x=104

              x=104:2

              x=52

Vậy x=52

86_5.(x+2)=16

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