Solutions by everydaycalculation.com
1st number: 1 14/21, 2nd number: 1/21
3521 - 121 is 3421.
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Related: 70/21-1/21 35/21-2/21 35/42-1/21 35/21-1/42 35/21-3/21 35/63-1/21 35/21-1/63 35/21-5/21 35/21-7/21
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