Solutions by everydaycalculation.com
1st number: 6/21, 2nd number: 1 7/21
621 - 2821 is -2221.
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Related: 12/21-28/21 6/21-56/21 6/42-28/21 6/21-28/42 18/21-28/21 6/21-84/21 6/63-28/21 6/21-28/63 30/21-28/21 42/21-28/21
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