27/31 - 13/31 = 14/31
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-2/3 - (-1/6) = -1/2
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-1/4 + 3/4 = 1/2
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-1/5 - 3/8 = -23/40
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3/7 - (-1/7) = 4/7
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1/7 + 3/7 + 2/7 = 6/7
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27/31 - 13/31 = 11/31
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-2/3 - (-1/6) = 1/2
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-1/4 + 3/4 = 2/4
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-1/5 - 3/8 = -4/40
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3/7 - (-1/7) = 3/6
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1/7 + 3/7 + 2/7 = 7/7
|
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