7 4/21 - 3 9/28 - 1 5/28 + 3 10/21= 10 14/21 - 4 14/28= 10 2/3 - 4 1/2= 10 4/6 - 4 3/6= 6 1/6
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7 4/21 - 3 9/28 - 1 5/28 + 3 10/21= 10 14/21 - 4 14/28= 10 2/3 - 4 1/2= 10 4/6 - 4 3/6= 6 1/6