Solutions by everydaycalculation.com
1st number: 3/12, 2nd number: 10 4/6
312 - 646 is -12512.
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Related: 6/12-64/6 3/24-64/6 3/12-64/12 9/12-64/6 3/36-64/6 3/12-64/18 15/12-64/6 3/60-64/6 3/12-64/30 21/12-64/6 3/84-64/6 3/12-64/42
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