Solutions by everydaycalculation.com
1st number: 4/12, 2nd number: 1 9/12
412 - 2112 is -1712.
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Related: 8/12-21/12 4/12-42/12 4/24-21/12 4/12-21/24 4/12-63/12 4/36-21/12 4/12-21/36 20/12-21/12 4/60-21/12 4/12-21/60 28/12-21/12 4/84-21/12 4/12-21/84
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