Solutions by everydaycalculation.com
1st number: 1 14/21, 2nd number: 10/21
3521 - 1021 is 2521.
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Related: 70/21-10/21 35/21-20/21 35/42-10/21 35/21-10/42 35/21-30/21 35/63-10/21 35/21-10/63 35/21-50/21 35/21-70/21
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