Question

Решил уравнения 5×x+80=690, x×8+120=280

Answer 1

5×x+80=690,
5х+80=690
5х=690-80
5х=610
х=610:5
х=122

x×8+120=280
8х+120=280
8х=280-120
8х=160
х=160:8
х=20

Answer 2

5*х+80=690
5х+80=690
5х=690-80
5х=610
х=610:5
х=122
Ответ:122
х*8+120=280
8х=280-120
8х=160
х=160:8
х=20
Ответ:20