Solutions by everydaycalculation.com
1421 - 1421 is 01.
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Related: 28/21-14/21 14/21-28/21 14/42-14/21 14/21-14/42 42/21-14/21 14/21-42/21 14/63-14/21 14/21-14/63 70/21-14/21 14/21-70/21 98/21-14/21 14/21-98/21
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