Question

решите уравнение :
1) -7 ( 2 -3m) = 56
2) (5 + 7a) * 15 = -30

Answer 1

1)
 -7 ( 2 -3m) = 56
-14+21m=56
21m=56+14
21m=70
m=70:21
m=3 1/3
=========
2)
(5 + 7a) * 15 = -30
75+105a=-30
105a=-30-75
105a=-105
a=-105:105
a=-1