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9236-[(3245-1236+63x4:2):5+a]+23124=31860

Răspuns :

9236-[(3245-1236+63x4:2):5+a]+23124=31860
-[(2009+126):5+a]=31860 -9236-23124
-(2135:5+a)=-500
427+a=500
a=500-427
a=73