Solutions by everydaycalculation.com
1621 - 821 is 821.
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Related: 32/21-8/21 16/21-16/21 16/42-8/21 16/21-8/42 48/21-8/21 16/21-24/21 16/63-8/21 16/21-8/63 80/21-8/21 16/21-40/21 16/21-56/21
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