1/4 + 2/4 = - 3/4, 3/8 + 2/8 = - 5/8, 5/10 + 3/10 = - 8/10, 2/5 + 2/5 = - 4/5, 1/2 + 3/4 = - 1 1/4, 1/3 + 1/6 = - 1/2, 2/5 + 2/10 = - 3/5, 3/2 + 1/2 = - 2, 2 1/3 + 2/3 = - 3, 5 1/4 + 1/4 = - 5 1/2,

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