Solutions by everydaycalculation.com
2021 - 1621 is 421.
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Related: 40/21-16/21 20/21-32/21 20/42-16/21 20/21-16/42 60/21-16/21 20/21-48/21 20/63-16/21 20/21-16/63 20/21-80/21
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