Solutions by everydaycalculation.com
1st number: 2/12, 2nd number: 7 0/12
212 - 8412 is -416.
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Related: 4/12-84/12 2/24-84/12 2/12-84/24 6/12-84/12 2/36-84/12 2/12-84/36 10/12-84/12 2/60-84/12 2/12-84/60 14/12-84/12 2/84-84/12
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