4 2/15 - х = 1 4/5
х = 4 2/15 - 1 4/5
х = 3 17/15 - 1 12/15
х = 2 5/15
х = 2 целых 1/3
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Проверка: 4 2/15 - 2 1/3 = 1 4/5
3 17/15 - 2 5/15 = 1 12/15 = 1 4/5
