2/5 - 1/3 = 6/15 - 5/15 = 1/15
1/6 + 5/12 = 2/12 + 5/12 = 7/12
5/9 - 4/27 = 15/27 - 4/27 = 14/27
1/8 + 3/8 = 4/8
7/10 - 1/2 = 7/10 - 5/10 = 2/10
7/12 + 1/2 = 7/12 + 6/12 = 13/12
2/7 + 5/14 = 4/14 + 5/14 = 9/14
11/15 - 2/5 = 11/15 - 6/15 = 5/15
5/6 - 1/6 = 4/6
1/6 + 3/5 = 5/30 + 18/30 = 13/30
3/4 - 2/5 = 15/20 - 8/20 = 7/20
1/3 + 5/12 = 4/12 + 5/12 = 9/12
5/8 - 3/16 = 10/16 - 3/16 = 7/16
1/10 +7/10 = 8/10
9/17 + 8/17 = 17/17