Solutions by everydaycalculation.com
1st number: 1 14/21, 2nd number: 7/21
3521 - 721 is 43.
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Related: 70/21-7/21 35/21-14/21 35/42-7/21 35/21-7/42 35/63-7/21 35/21-7/63 35/21-35/21 35/21-49/21
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