Question

calcular x si se cumple:

Answer 1

Explicación paso a paso:

$4 \times (x - 9) \times 5 = 200 \\ 20 \times (x - 9) = 200 \\ x - 9 = \frac{200}{20} \\ x - 9 = 10 \\ x = 10 + 9 \\ x = 19$