Solutions by everydaycalculation.com
1st number: 10/12, 2nd number: 3 6/12
1012 - 4212 is -83.
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Related: 20/12-42/12 10/12-84/12 10/24-42/12 10/12-42/24 30/12-42/12 10/36-42/12 10/12-42/36 50/12-42/12 10/60-42/12 10/12-42/60 70/12-42/12 10/84-42/12 10/12-42/84
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