12-1/7=11 1/1-1/7=11 7/7-1/7=11 6/7
21-4/13=20 1/1-4/13=20 13/13-4/13=20 9/13
45-23/43=44 1/1-23/43=44 43/43-23/43=44 20/43
13-41/70=12 1/1-41/70=12 70/70-41/70=12 29/70
36-7/53=35 1/1-7/53=35 53/53-7/53=35 46/53
35-34/71=34 1/1-34/71=34 71/71-34/71=34 37/71
46-53/62=45 1/1-53/62=45 62/62-53/62=45 9/62