Question

1)84a+25a+7=443
2)4(9+7x)+21=393
3)486:(5x+2)=18
4)5(14+b)+6b=158
Решите уравнения

Answer 1

1)109х=436
х=4
2)36+28х+21=393
28х=336
х=12
3)5х+2=486/18
5х+2=27
5х=25
х=5
4)70+5b+6b=158
11b=88
b=8