Solutions by everydaycalculation.com
1st number: 9/12, 2nd number: 5 3/12
912 - 6312 is -92.
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Related: 18/12-63/12 9/24-63/12 9/12-63/24 27/12-63/12 9/36-63/12 9/12-63/36 45/12-63/12 9/60-63/12 9/12-63/60 63/12-63/12 9/84-63/12 9/12-63/84
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