2400:(с-12)=10 тендеуди шеш

Question

2400:(с-12)=10 тендеуди шеш

Answer 1

2400:(с-12)=10
с-12=2400:10
с-12=240
с=240+12
с=252.          проверка  2400:(252-12)=10
                                      2400:240=10
                                               10=10.