Question

уровнения x-120=280 320:b=40

Answer 1

x-120=280

x=280+120

x=400

проверка

400-120=280

280=280

========================

320:b=40

b=320:40

b=8

проверка

320:8=40

40=40

Answer 2

x-120=280

x=280+120

x=400

 

320/b=40

b=320/40

b=8