Respuesta:
[tex] \frac{3(x + 5)}{3} + \frac{5(x + 7)}{3} = 62 \\ \frac{3x + 15}{3} + \frac{5x + 35}{3} = 62 \\ 3x + 15 + 5x + 35 = 186 \\ 8x + 50 = 186 \\ 8x = 186 - 50 \\8 x = 136 \\ x = \frac{136}{8} = 17[/tex]
Explicación paso a paso:
[tex] \frac{3(17 + 5)}{3} + \frac{5(17 + 7)}{3} = \\ \frac{3 \times (22)}{3} + \frac{5(24)}{3} = \\ = 22 + \frac{120}{3} = 22 + 40 = 62[/tex]
espero te sirva