8/11 − 4/15 = 76/165
4/1 - 27/11 = 15/11 or 14/11
4 - 15 = -11
15/9 - 4/9 = 11/9
-4 + 15 = 11
8/11 - 4/15 = 120/165 - 44/165 = 76/165 which cannot be simplified.
-15 minus -4 is -11.
4/9 minus 3/4 equals -11/36
2/3
17/3 minus 15/4 is 1 11/12
-3/11 − -4/11 = 1/11
4/5 - 8/15 = 12/15 - 8/15 = 4/15