2/5 + 1/5 = - 3/5, 8/5 + 2/5 = - 10/5, 5/3 + 12/3 = - 17/3, 15/2 - 9/2 = - 6/2, 5/9 - 1/9 = - 4/9, 3/2 x 9/11 = - 27/22, 5/2: 4/3 = - 15/8, 2/5: 6/10 = - 20/30, 5/3 x 2/5 = - 10 /15,

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