Solutions by everydaycalculation.com
1st number: 1 6/12, 2nd number: 1 9/12
1812 - 2112 is -14.
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Related: 36/12-21/12 18/12-42/12 18/24-21/12 18/12-21/24 54/12-21/12 18/12-63/12 18/36-21/12 18/12-21/36 90/12-21/12 18/60-21/12 18/12-21/60 18/84-21/12 18/12-21/84
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