6/7 minus 2/6 is 11/21
6/7 - 2/7 = 4/7
6/14 minus 2/7 = 3/7 - 2/7 = 1/7
6 over 7 minus 5 over 7 is 1 over 7.
6
2 and 3/7 minus 8/14 = 13/7 or 1 and 6/7
9/7 or 1 2/7
14
2
-3 minus 7/2 is -6 1/2 or -6.5
6/7 - 2/3 = 18/21 - 14/21 = 4/21
6/7 - 2/3 = 18/21 - 14/21 = 4/21