Solutions by everydaycalculation.com
1st number: 3 6/12, 2nd number: 1/12
4212 - 112 is 4112.
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Related: 84/12-1/12 42/12-2/12 42/24-1/12 42/12-1/24 42/12-3/12 42/36-1/12 42/12-1/36 42/12-5/12 42/60-1/12 42/12-1/60 42/12-7/12 42/84-1/12 42/12-1/84
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