Question

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

Answer 1

1) -14+21х=56
21х=56+14
21х=70
х=70/21
x=10/3

2) 75+105a=-30
105a = -105
a=-1

Answer 2

1) -14+21х=56
21х=56+14
21х=70
х=70/21
х=10/3=3 1/3

2) 75+105а= -30
105а= -30-75
105а=-105
а=-105:105
а= -1