Question

Решите уравнения:
1) -7(2-3х)=56
2) (5+7а)*15=-30

Answer 1

1)-14+21х=56
21х=70
х=3 1/3

2)75+105а=-30
105а=-105
а=-1

Answer 2

1) -7(2-3х)=56
2-3x=56:(-7)
2-3x=-8
10=3x
x=10/3
x=3$\frac{1}{3}$

2) (5+7а)*15=-30
5+7a=-30:15
5+7a=-2
7a=-7
a=-1