8х + 11 2/11 = 15
8х = 15 - 11 2/11
8х = 3 9/11
8х = 42/11
х = 42/11 : 8
х = 42/11 · 1/8
х = 42/88
х = 21/44 - сократили на 2
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Проверка:
8 · 21/44 + 11 2/11 = 15
168/44 + 11 2/11 = 15
3 36/44 + 11 2/11 = 15
3 9/11 + 11 2/11 = 15
14 11/11 = 15
15 = 15