Solutions by everydaycalculation.com
1st number: 1 15/21, 2nd number: 1 19/21
3621 - 4021 is -421.
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Related: 72/21-40/21 36/21-80/21 36/42-40/21 36/21-40/42 36/63-40/21 36/21-40/63
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