1/2 + 1/4 = - 3/4, 3/8 + 1/4 = - 5/8, 5/6 + 3/7 = - 53/42, 5/12 + 1/3 = - 9/12, 3/8 + 1/16 = - 7/16 , 3/5 + 1/7 = - 26/35 ,

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