3/5 + 1/5 = - 4/5, 6/8 - 3/8 = - 3/8, 7/10 - 4/10 = - 3/10, 1/4 + 3/4 =  - 4/4, 1/4 + 1/2 =  - 3/4, 2/8 + 1/4 =  - 4/8, 3/12 + 1/6 = - 5/12, 1/10 + 1/2 =  - 6/10, 1/2 - 2/8 =  - 2/8, 1/3 - 1/12 =  - 3/12, 1/3 + 1/4 = - 7/12, 2/4 + 1/5 = - 14/20,

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