Solutions by everydaycalculation.com
1621 - 1621 is 01.
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Related: 32/21-16/21 16/21-32/21 16/42-16/21 16/21-16/42 48/21-16/21 16/21-48/21 16/63-16/21 16/21-16/63 80/21-16/21 16/21-80/21
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