Solutions by everydaycalculation.com
1821 - 421 is 23.
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Related: 36/21-4/21 18/21-8/21 18/42-4/21 18/21-4/42 54/21-4/21 18/21-12/21 18/63-4/21 18/21-4/63 90/21-4/21 18/21-20/21 18/21-28/21
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