Solutions by everydaycalculation.com
1st number: 1 9/21, 2nd number: 1 14/21
3021 - 3521 is -521.
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Related: 60/21-35/21 30/21-70/21 30/42-35/21 30/21-35/42 90/21-35/21 30/63-35/21 30/21-35/63
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