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

Răspuns :

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

(11+a-1111+777)x7=7777 - 777

(11+a - 1111 + 777) × 7 = 7000

11+a - 1111+777 = 7000:7

11+a - 1111+777 = 1000

11+a - 1111 = 1000-777

11+a - 1111 = 223

11+a = 223 + 1111

11+a = 1334

a = 1334 - 11

a = 1323