Solutions by everydaycalculation.com
1st number: 4/12, 2nd number: 2 4/12
412 - 2812 is -21.
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Related: 8/12-28/12 4/12-56/12 4/24-28/12 4/12-28/24 4/12-84/12 4/36-28/12 4/12-28/36 20/12-28/12 4/60-28/12 4/12-28/60 28/12-28/12 4/84-28/12 4/12-28/84
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