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49:7+[49+(48:3+36:9+7:7)]:10=?

Răspuns :

7+[49+(16+4+1)]:10=7+(49+21)=7+70=77

49:7+[49+(16+4+1)]:10=
49:7+[49+21]:10=
49:7+70:10=
7+7=
14