Solutions by everydaycalculation.com
1821 - 1621 is 221.
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Related: 36/21-16/21 18/21-32/21 18/42-16/21 18/21-16/42 54/21-16/21 18/21-48/21 18/63-16/21 18/21-16/63 90/21-16/21 18/21-80/21
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