11/6 − 7/9 = 7/18
6 over 7 minus 5 over 7 is 1 over 7.
1/2 minus 3/7 is 1/14
7/12 minus 1/3 = 1/4
1 over 7 minus 28 over 28 = -168/196 which reduces to -6/7
3 4/7 minus 1/7 is 3 3/7
11/12 minus 7/12 is 1/3
9/10 minus 7/8 is 1/40
7/9 minus 3/4 is 1/36
1 -------- 9-7 -------- 9
1/2 minus 3/7 is 1/14
6/14 minus 2/7 = 3/7 - 2/7 = 1/7
7 over 8