Question

3(5-x)-3(1-2x)=42 alguém sabe me informa

Answer 1

$\LARGE\tt{}3(5 - x) - 3(1 - 2x) = 42 \\ \LARGE\tt{}15 - 3x - 3(1 - 2x) = 42 \\ \LARGE\tt{}15 - 3x - 3 + 6x = 42 \\ \LARGE\tt{}12 - 3x + 6x = 42 \\ \LARGE\tt{}12 + 3x = 42 \\ \LARGE\tt{}3x = 42 - 12 \\ \LARGE\tt{}3x = 30 \\ \\ \LARGE\tt{}x = \dfrac{30}{3} \\ \\ {\large\boxed{\boxed{  { \LARGE \tt x = 10 }}}}$

Bons estudos!