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9/15 - 2/15 - 10/15 = - 3/15 = - 1/15
7 2/3 - 6 4/6 * 9/100 = 7 2/3 - 40/6 *9/100 = 7 2/3 - 3/5 = 7 10/15 - 9/15 = 71/15
4 3/4 - 1 7/8 = 4 6/8 - 1 7/8 = 2 7/8
1 1/12 - 1 1/12 : (-13) = 1 1/12 - 13/12 * (-1/13) = 1 1/12 + 1/12 = 1 2/12 = 1 1/6
4 4/9 - (-3 3/8) = 4 32/72 + 3 27/72 = 7 59/72