Question

3 (5-x) - 3(1-2x) = 42

Answer 1

Olá Marise !

$3 ( 5 - x ) - 3 ( 1 - 2x ) = 42 \\ 15 - 3x - 3 + 6x = 42 \\ - 3x + 6x = 42 - 15 + 3 \\ 3x = 30 \\ x= \frac{30}{3} \\ x = 10$

tenha bons estudos !