Question

(x – 4) / 7 = (x + 7) / 9

Answer 1

Respuesta:

$\frac{(x - 4)}{7} = \frac{(x + 7)}{9} \\ 9(x - 4) = 7(x + 7) \\ 9x - 36 = 7x + 49 \\ 2x = 85 \\ x = 42.5$