Solutions by everydaycalculation.com
1st number: 6/21, 2nd number: 1 14/21
621 - 3521 is -2921.
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Related: 12/21-35/21 6/21-70/21 6/42-35/21 6/21-35/42 18/21-35/21 6/63-35/21 6/21-35/63 30/21-35/21 42/21-35/21
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