3/4+2/5 = 15/20-8/20=7/20
5/7-1/6 = 30/42 - 7/42 = 23/42
3/4-1/3 = 9/12 - 4/12 =5/12
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3/4+2/5 = 15/20-8/20=7/20
5/7-1/6 = 30/42 - 7/42 = 23/42
3/4-1/3 = 9/12 - 4/12 =5/12