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4/8 + 5/6 = 1/2 + 5/6 = 3/6 + 5/6 = 8/6 = 4/3
4/5 - 4/7 = 28/35 - 20/35 = 8/35
5/9 - 4/7 = 35/63 - 36/63 = -1/63