2400 ÷ ( a - 12 ) = 10

Question

2400 ÷ ( a - 12 ) = 10

Answer 1

A-12=2400:10
a-12=240
a=240+12
a=252
Проверка:
2400:(252-12)=10
252-12=240
2400:240=10
10=10