Solutions by everydaycalculation.com
1821 - 821 is 1021.
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Related: 36/21-8/21 18/21-16/21 18/42-8/21 18/21-8/42 54/21-8/21 18/21-24/21 18/63-8/21 18/21-8/63 90/21-8/21 18/21-40/21 18/21-56/21
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