9236-[(3245-1236+63x4:2):5xa]+23124=31860
9236-[(3245-1236+252:2):5xa]+23124=31860
9236-[(3245-1236+126):5xa]+23124=31860
9236-[(2009+126):5xa]+23124=31860
9236-(2135:5xa)+23124=31860
9236-(427xa)+23124=31860
9236-427xa+23124=31860
8809xa+23124=31860
8809xa=31860-23124
8809xa=8736
a=8809-8736
a=73