Solutions by everydaycalculation.com
1st number: 3/12, 2nd number: 6 0/12
312 - 7212 is -234.
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Related: 6/12-72/12 3/24-72/12 3/12-72/24 9/12-72/12 3/36-72/12 3/12-72/36 15/12-72/12 3/60-72/12 3/12-72/60 21/12-72/12 3/84-72/12 3/12-72/84
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