12/11 = 108/99
10/9 = 110/99
10/9 - 12/11 = 2/99
12/11 - 10/9 = -2/99
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35/12 - 8/12 = 41/12 - 8/12 = 33/12 = 11/4 = 23/4 or 2.75
5/6
== == 7/12 - 11/12 = -4/12 or -1/3.
5/12 - 4/12 = 1/12
17 + 11 = 28 + 25 = 53 - 12 = 41.