2/7- 2/7
3/9+2/9
4/20+5/20+7/20
4/5-2/5
2/5 + 2/5
5/11- 2/11
5/12-3/12
3/8+4/8
5/10 + 5/10
12/15 - 5/15
1
0
16/20
2/12
7/8
4/5
5/9
2/5
3/11
7/15
