Solutions by everydaycalculation.com
1st number: 3/12, 2nd number: 2 0/6
312 - 126 is -74.
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Related: 6/12-12/6 3/12-24/6 3/24-12/6 9/12-12/6 3/12-36/6 3/36-12/6 3/12-12/18 15/12-12/6 3/12-60/6 3/60-12/6 3/12-12/30 21/12-12/6 3/12-84/6 3/84-12/6 3/12-12/42
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