Solutions by everydaycalculation.com
1st number: 4/21, 2nd number: 1 7/21
421 - 2821 is -87.
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Related: 8/21-28/21 4/21-56/21 4/42-28/21 4/21-28/42 12/21-28/21 4/21-84/21 4/63-28/21 4/21-28/63 20/21-28/21 28/21-28/21
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