9 7/13-5 9/13=8 20/13-5 9/13=3 11/13
15-19/25=14 25/25-19/25=14 6/25
7-26/43=6 43/43-26/43=6 17/23
18-11 5/7=17 17/7-11 5/7=6 2/7
6-2 4/23=5 -2 4/23=3 19/23
21-8/18=20 18/18-8/18=20 10/18=20 5/9
9 7/13-5 9/13=8 20/13-5 9/13=3 11/13
15-19/25=14 25/25-19/25=14 6/25
7-26/43=6 43/43-26/43=6 17/23
18-11 5/7=17 17/7-11 5/7=6 2/7
6-2 4/23=5 -2 4/23=3 19/23
21-8/18=20 18/18-8/18=20 10/18=20 5/9