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(635+749:7+678:3)-(312:3+628:4+510:5)-a=578

Răspuns :

(635+749:7+678:3)-(312:3+628:4+510:5)-a=578
(635+107+226)-(104+157+102)-a=578
968-363-a=578
605-a=578
a=605-578
a=27