5/6 + (- 7/12) = 5/6 - 7/12 = 10/12 - 7/12 = 3/12 = 1/4,
-3/10 - 1/15 = - (3/10 + 1/15) = - (9/30 + 2/30) = - 11/30
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5/6 + (- 7/12) = 5/6 - 7/12 = 10/12 - 7/12 = 3/12 = 1/4,
-3/10 - 1/15 = - (3/10 + 1/15) = - (9/30 + 2/30) = - 11/30