Question

решите уравнения (c-120)×70=280

Answer 1

c-120=280:70
с-120=4
с=4+120
с=124

Answer 2

(c-120)*70=280
c-120=280:70
c-120=4
c=120+4
c=124
Проверка:
(124-120)*70=280
280=280