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First convert all three numbers to fractions with 24 as the denominator (because 24 is the lowest common multiple of 2, 12, and 8). 2½ = 60/24. 5/12 = 10/24. 7/8 = 21/24. Now perform the subtractions: 60/24 - 10/24 - 21/24 = 29/24 = 1 5/24.

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