8 - 2 3/7 = 7 7/7 - 2 3/7 = 5 4/7
6 - 1 5/9 = 5 9/9 - 1 5/9 = 4 4/9
10 - 5 4/11 = 9 11/11 - 5 4/11 = 4 7/11
