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7777-(77:7+a-7777:7+777)*7=777 dau coroana repede

Răspuns :

7777-(11+a-1111+777)*7=777
7777-(a-323)*7=777
7777-7a+2261=777  /-1
7a=7777-777+2261
7a=9261
a=9261:7
a=1323