Question

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

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

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

Answer 1

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

Answer 2

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

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

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

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

Answer 3

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

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

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

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

Answer 4

\(10\left(x-7\right)-8\left(x+5\right)=6\left(-5\right)+24\)

\(\Rightarrow10x-70-8x-40=-30+24\)

\(\Rightarrow10x-8x=-30+24+70+40\)

\(\Rightarrow2x=-30+24+70+40=104\)

\(\Rightarrow x=104:2=52\)

Answer 5

-3(x-5)+6(x+2)=9\(\Rightarrow-3\chi+15+6\chi+12=9\)

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

\(\Rightarrow3\chi=-18\Rightarrow\chi=-6\)

HTDT

Answer 6

\(=-6\)

Hk tốt

Answer 7

\(=-6\)

Hk tốt

Answer 8

\(=-6\)

Hk tốt

Answer 9

b) => 7x-63-30+5x=-6+11x

=>   x=87

Hok tốt 

Answer 10

c)

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

=>  2x=104

=>   x=52