Question

решите уравнение: 4-х/7=х/9

Answer 1

$4- \frac{x}{7} = \frac{x}{9}$
$\frac{x}{9} + \frac{x}{7} =4$
оз: 7*9=63
$\frac{7x+9x}{63} =4$
$16x=4*63$
$16x=252$
$x=252:16$
$x=15,75$