Solutions by everydaycalculation.com
1st number: 8/12, 2nd number: 1 3/12
812 - 1512 is -712.
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Related: 16/12-15/12 8/12-30/12 8/24-15/12 8/12-15/24 24/12-15/12 8/12-45/12 8/36-15/12 8/12-15/36 40/12-15/12 8/12-75/12 8/60-15/12 8/12-15/60 56/12-15/12 8/84-15/12 8/12-15/84
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