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9236-{(3245-1236+63x4impartit la 2)impartit la 5+a]+23124=31860 este cu a

Răspuns :

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