1- 5/17= 12/17
9- 7/15= 8 8/15
11 5/12- 7=4 5/12
5 3/4- 3 5/7= 5 21/28 - 3 20/28= 2 1/28
6 3/5- 4 5/7= 6 21/35- 4 25/35= 1 31/35
25 8/19+36 11/19=62
2 7/12+ 4 13/18=2 21/36+ 4 26/36= 7 11/36
2 3/8+6 5/12+ 4 5/14= 2 63/168+ 6 70/168+ 4 60/168=13 25/168