Solutions by everydaycalculation.com
1st number: 3/12, 2nd number: 3 9/12
312 - 4512 is -72.
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Related: 6/12-45/12 3/12-90/12 3/24-45/12 3/12-45/24 9/12-45/12 3/36-45/12 3/12-45/36 15/12-45/12 3/60-45/12 3/12-45/60 21/12-45/12 3/84-45/12 3/12-45/84
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