Solutions by everydaycalculation.com
1st number: 1 14/21, 2nd number: 5/7
3521 - 57 is 2021.
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Related: 70/21-5/7 35/21-10/7 35/42-5/7 35/21-5/14 35/21-15/7 35/63-5/7 35/21-5/21 35/21-25/7 35/21-5/35 35/21-35/7 35/21-5/49
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