10 6/7 - 63/11 = 5 10/11
10 6/7 - 5 8/11 = 10 66/77 - 5 56/77 = 5 10/77
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10 6/7 - 63/11 = 5 10/11
10 6/7 - 5 8/11 = 10 66/77 - 5 56/77 = 5 10/77