Solutions by everydaycalculation.com
1st number: 4/21, 2nd number: 2 6/21
421 - 4821 is -4421.
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Related: 8/21-48/21 4/21-96/21 4/42-48/21 4/21-48/42 12/21-48/21 4/63-48/21 4/21-48/63 20/21-48/21 28/21-48/21
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