Solutions by everydaycalculation.com
1st number: 4/21, 2nd number: 4 1/6
421 - 256 is -16742.
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Related: 8/21-25/6 4/21-50/6 4/42-25/6 4/21-25/12 12/21-25/6 4/21-75/6 4/63-25/6 4/21-25/18 20/21-25/6 4/21-25/30 28/21-25/6 4/21-25/42
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