2/5 + 3/4 = - 1 3/20, 3/7 + 2/6 =  - 32/42, 6/8 - 2/3 = - 2/24, 4/9 + 6/10 = - 1 4/90, 2/8 - 1/5 = - 2/40, 7/12 - 3/9 = - 27/108, 4/8 - 2/9 - 20/72, 4/6 + 2/12 = - 48/72, 8/11 - 3/10 = - 47/110, 3/12 + 5/8 = - 84/96, 5/10 - 3/7 = - 5/70, 4/11 + 3/7 = - 61/77, 2/9 + 5/12 = - 69/108, 2/3 - 1/7 = - 11/21, 2/3 + 9/10 = - 1 17/30,

Adding and Subtracting Fractions with Unlike Denominators

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