Solutions by everydaycalculation.com
1st number: 3/12, 2nd number: 2 8/12
312 - 3212 is -2912.
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Related: 6/12-32/12 3/12-64/12 3/24-32/12 3/12-32/24 9/12-32/12 3/12-96/12 3/36-32/12 3/12-32/36 15/12-32/12 3/60-32/12 3/12-32/60 21/12-32/12 3/84-32/12 3/12-32/84
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