Solutions by everydaycalculation.com
1st number: 8/12, 2nd number: 1 9/12
812 - 2112 is -1312.
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Related: 16/12-21/12 8/12-42/12 8/24-21/12 8/12-21/24 24/12-21/12 8/12-63/12 8/36-21/12 8/12-21/36 40/12-21/12 8/60-21/12 8/12-21/60 56/12-21/12 8/84-21/12 8/12-21/84
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