Solutions by everydaycalculation.com
1st number: 2 3/21, 2nd number: 1/21
4521 - 121 is 4421.
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Related: 90/21-1/21 45/21-2/21 45/42-1/21 45/21-1/42 45/21-3/21 45/63-1/21 45/21-1/63 45/21-5/21 45/21-7/21
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