Solutions by everydaycalculation.com
1st number: 3/12, 2nd number: 3 6/12
312 - 4212 is -134.
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Related: 6/12-42/12 3/12-84/12 3/24-42/12 3/12-42/24 9/12-42/12 3/36-42/12 3/12-42/36 15/12-42/12 3/60-42/12 3/12-42/60 21/12-42/12 3/84-42/12 3/12-42/84
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