315 : (162+12*24 - 11*39 ) + 558:31=33
12*24=288
11*39=429
162+288-429=21,
315: 21=15
558:31=18
15+18=33
315 : (162+12*24 - 11*39 ) + 558:31=33
12*24=288
11*39=429
162+288-429=21,
315: 21=15
558:31=18
15+18=33