Question

$x + \frac{x}{3} = 40$

Answer 1

$x + \frac{x}{3} = 40\\\\ \frac{3x}{3} + \frac{x}{3} = \frac{120}{3}\\\\ 4x = 120\\\\ x = \frac{120}{4}\\\\ x = 30$

Resposta: 30

Espero ter ajudado!