Question

Giải giúp mình nha: Tìm x 

3.(-x+1)-2.(x+7)-3^2= -(-2x-9)-1^58

Thanks trước nha!!!!!! ^,^

Answer 1

3 . (-x + 1) - 2.(x + 7) - 3² = -(-2x - 9) - 1⁵⁸

=> -3x + 3 - 2x - 14 - 9 = 2x + 9 - 1

=> -3x - 2x - 2x = 9 - 1 + 9 + 14 - 3

=> -7x = 28

=> x = 28 : (-7)

=> x = -4

Vậy ...

Answer 2

=>(-3x+3)-(2x+14)-9=2x+9-1

=>(-3x-2x)-(14-3+9)=2x+8

=>-5x-20=2x+8

=>2x+5x=-8-20

=>-7x=-28

=>x=-28/7