х + 11/12 = 5/6
х=5/6-11/12
х=10/12 - 11/12
х=- 1/12
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х + 11/12 = 5/6
х=5/6-11/12
х=10/12 - 11/12
х=- 1/12
х = 5/6 - 11/12
х = 10/12 - 11/12
х = - 1/12
Проветка:
-1/12 + 11/12 = 10/12 = 5/6
5/6= 5/6