Question

A Situaçao Das Equaçao 5x+3)+2(x+1)=31 é a)9 b)3 c)2 d)1 e)0

Answer 1

5(x+3) + 2(x+1) = 31 →
5x + 15 + 2x + 2 = 31 →
7x + 17 = 31 →
7x = 31 - 17 →
7x = 14 →
x = $\frac{14}{7}$ →
x = 2.

Alternativa C