Question

помогите срочно надо!!
4(9+7х)+21=393
5(14+b)+6b=158

Answer 1

1)4(9+7x)+21=393
36+28x+21=393
28x=393-36-21
28x=336
x=336:28
x=12
2)5(14+b)+6b=158
70+11b=158
11b=158-70
11b=88
b=8

Answer 2

4(9+7x)+21=393
36+28x+21=393
28x=393-36-21
28x=336
x=336:28
x=12
5(14+b)+6b=158
70+5b+6b=158
5b+6b=158-70
11b=88
b=88:11
b=8.