Solutions by everydaycalculation.com
1st number: 6/42, 2nd number: 4 1/6
642 - 256 is -16942.
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Related: 12/42-25/6 6/42-50/6 6/84-25/6 6/42-25/12 18/42-25/6 6/42-75/6 6/42-25/18 30/42-25/6 6/42-25/30 6/42-25/42
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