5/9 − 5/12 = 5/36
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5/9 = 60/108 factor out 12, top and bottom 12*5/12*9 eliminate 12; top and bottom 5/9 ------
12 x 9 - 13 = 95
5/12 +4/9 = 15/36 = 16/36 = 31/36
81/4+ 15/12= 8 + 1 + 1/4 + 5/12 = 9 + 3/12 + 5/12 = 9 + 8/12 = 92/3
3/4 + 5/6 = 9/12 + 10/12 = 19/12 = 17/12