Question

Решить уравнения
-7(2-3х)=56
(5+7а)*15=-30

Answer 1

1.
-7(2-3х)=56
-14+21х=56
21х=70
3х=10
$x = \frac{10}{3}$
2. (5+7а)15=-30
(5+7а)=-2
7а=-7
$a = \frac{ - 7}{7} \\ a = - 1$