Solutions by everydaycalculation.com
1421 - 621 is 821.
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Related: 28/21-6/21 14/21-12/21 14/42-6/21 14/21-6/42 42/21-6/21 14/21-18/21 14/63-6/21 14/21-6/63 70/21-6/21 14/21-30/21 98/21-6/21 14/21-42/21
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