Question

expressao 2(x+1)+5(x-1)=7

Answer 1

2(x + 1) + 5(x - 1) = 7
2x + 2 + 5x - 5 = 7
2x + 5x + 2 - 5 = 7
7x - 3 = 7
7x = 7 + 3
7x = 10
x = 10/7

Resposta: 10/7