Solutions by everydaycalculation.com
1st number: 1 9/21, 2nd number: 7/9
3021 - 79 is 4163.
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Related: 60/21-7/9 30/21-14/9 30/42-7/9 30/21-7/18 90/21-7/9 30/21-21/9 30/63-7/9 30/21-7/27 30/21-35/9 30/21-7/45 30/21-49/9 30/21-7/63
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