Question

$2x + 3 + 6x = x + 8$

Answer 1

2x + 3 + 6x = x + 8
8x + 3 = x + 8
termo de x separa dos termos independentes. muda de lado, muda de sinal
8x - x =  8 - 3
calcula
7x = 5
x = 5/7 ****