Solutions by everydaycalculation.com
2021 - 1421 is 27.
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Related: 40/21-14/21 20/21-28/21 20/42-14/21 20/21-14/42 60/21-14/21 20/21-42/21 20/63-14/21 20/21-14/63 20/21-70/21 20/21-98/21
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