Question

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

Answer 1

-7(2-3х)=56
2-3x=-8
-3x=-10
x=3/10

(5+7а)•15=-30‭ |•15
75+105a=-30
105a-30-75
105a=-105
a=-1

Answer 2

1) -14+21x=56
21x=56-(-14)
21x=70
X=21:70
X= 0,3
2)75+105a=-30
105a=-30-75
105a=-105
a=105:(-105)
a=-1