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7777-(77:7+a-7777:7+7777)×7=777

Răspuns :

7777-(77:7+a-7777:7+7777)×7=777
-(11+a-1111+7777)×7=777 -7777
-(11+a+6666)×7=-7000
(a+6677)×7=7000
a+6677=1000
a=-5677