Solutions by everydaycalculation.com
1st number: 3/12, 2nd number: 2 3/12
312 - 2712 is -21.
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Related: 6/12-27/12 3/12-54/12 3/24-27/12 3/12-27/24 9/12-27/12 3/12-81/12 3/36-27/12 3/12-27/36 15/12-27/12 3/60-27/12 3/12-27/60 21/12-27/12 3/84-27/12 3/12-27/84
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