Solutions by everydaycalculation.com
2021 - 821 is 47.
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Related: 40/21-8/21 20/21-16/21 20/42-8/21 20/21-8/42 60/21-8/21 20/21-24/21 20/63-8/21 20/21-8/63 20/21-40/21 20/21-56/21
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