Solutions by everydaycalculation.com
1st number: 5/12, 2nd number: 3 6/12
512 - 4212 is -3712.
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Related: 10/12-42/12 5/12-84/12 5/24-42/12 5/12-42/24 15/12-42/12 5/36-42/12 5/12-42/36 25/12-42/12 5/60-42/12 5/12-42/60 35/12-42/12 5/84-42/12 5/12-42/84
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