Solutions by everydaycalculation.com
1st number: 1 6/21, 2nd number: 5/21
2721 - 521 is 2221.
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Related: 54/21-5/21 27/21-10/21 27/42-5/21 27/21-5/42 81/21-5/21 27/21-15/21 27/63-5/21 27/21-5/63 27/21-25/21 27/21-35/21
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