3 5/6 - 1 1/6 + 2 3/6 = - 5 1/6, 1 6/7 + 2 2/7 - 3 4/7 = - 4/7, 3 8/9 - 2 4/9 + 1 1/9 = - 2 5/9, 2 3/10 + 1 4/10 - 3 2/10 = - 1/2, 5 1/2 - 3 1/6 + 1 1/3 = - 3 2/3,

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