Question

nas figuras, calcule x sendo A//B//C

Answer 1

$\frac{2x + 2}{4} = \frac{5x - 1}{7} \\ 4(5x - 1) = 7(2x + 2) \\ 20x - 4 = 14x + 14 \\ 20x - 14x = 14 + 4 \\ 6x = 18 \\ x = \frac{18}{6} \\ \boxed{x = 3}$