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7777-(77:7+a-7777:7 +777)x7=777

Răspuns :

7777-(77:7+a-7777:7 +777)x7=777
( 11 + a - 1 111 + 777) × 7 = 7 777 - 777
( 11 + a - 1 111 + 777) = 7 000 : 7
11 + a - 1 111 + 777 = 1 000
11 + a = 1 000 + 1 111 - 777
11 + a = 2 111 - 777
11 + a = 1 334
a = 1 334 - 11
a = 1 323