-7/12 - -1/3 - 1/4 = ?, 7/15 - 4/5 - 1/3 = ?, 7/8 - 3/8 + 1/2 = ?, 7/12 - 5/6 - 1/4 = ?, 5/6 - 1/2 + 1/3 = ?, -11/20 - -3/4 + 1/5 = ?, -17/21 - -2/3 - 1/7 = ?, 2/15 - 4/5 - 2/3 = ?, -23/24 - -5/8 - 1/3 = ?, -11/18 - -7/9 + 1/6 = ?,

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