1/5 - 1/6 = 6/30 - 5/30 = 1/30
3/4 - 1/3 = 9/12 - 4/12 = 5/12
7/9 - 2/11 = 77/99 - 18/99 = 59/99
3/4 - 4/9 = 27/36 - 16/36 = 11/36
7/5 - 6/12 = 84/60 - 30/60 = 54/60 = 9/10
11/12 - 11/18 = 66/72 - 44/72 = 22/72 = 11/36
1/5 - 1/6 = 6/30 - 5/30 = 1/30
3/4 - 1/3 = 9/12 - 4/12 = 5/12
7/9 - 2/11 = 77/99 - 18/99 = 59/99
3/4 - 4/9 = 27/36 - 16/36 = 11/36
7/5 - 6/12 = 84/60 - 30/60 = 54/60 = 9/10
11/12 - 11/18 = 66/72 - 44/72 = 22/72 = 11/36