Question

5а + 3
_____ равно -5
3а - 10

Answer 1

$\frac{5a + 3}{3a - 10} = - 5$
$5a + 3 = - 5 \times (3a - 10)$
$5a + 3 = - 15a + 50$
$20a = 47$
$a = \frac{47}{20} = 2 \times \frac{7}{20}$