Question

2(×+1)-(×-1)=0.........

Answer 1

Olá,

2(x+1) = 2x+2
-(x-1) = -x+1

Então:

2(x+1)-(x-1) = 0
2x+2-x+1 = 0
2x-x+2+1 = 0
x+3 = 0
x = -3