Solutions by everydaycalculation.com
1st number: 3/12, 2nd number: 1 9/12
312 - 2112 is -32.
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Related: 6/12-21/12 3/12-42/12 3/24-21/12 3/12-21/24 9/12-21/12 3/12-63/12 3/36-21/12 3/12-21/36 15/12-21/12 3/60-21/12 3/12-21/60 21/12-21/12 3/84-21/12 3/12-21/84
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