9/11 - 1/2 = 18/22 - 11/22 = 7/22
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11/12 - 2/9 = 25/36
Nine over 11 is already in simplest form.9/11 is in its simplest form.
12/11 = 108/99 10/9 = 110/99 10/9 - 12/11 = 2/99 12/11 - 10/9 = -2/99
5/9 + 2/3 = 5/9 +6/9 = 11/9 = 1 2/9
1/2 + 1/9 = 9/18 + 2/18 = 11/18