Solutions by everydaycalculation.com
1st number: 8/12, 2nd number: 3 9/12
812 - 4512 is -3712.
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Related: 16/12-45/12 8/12-90/12 8/24-45/12 8/12-45/24 24/12-45/12 8/36-45/12 8/12-45/36 40/12-45/12 8/60-45/12 8/12-45/60 56/12-45/12 8/84-45/12 8/12-45/84
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