5/16 + 3/4 = - ?/16, 7/6 + 9/4 = - ?/12, 5/3 + 1/2 = - ?/6, 2/7 + 4/2 =  - ?/14, 9/2 - 2/5 = - ?/10, 3/4 - 3/8 = - ?/8, 1/4 - 2/15 = - ?/60, 9/6 - 3/10 = - ?/30, 4/8 - 5/12 = - ?/24, 1/9 + 5/6 = - ?/18,

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