Solutions by everydaycalculation.com
1421 - 721 is 13.
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Related: 28/21-7/21 14/21-14/21 14/42-7/21 14/21-7/42 42/21-7/21 14/63-7/21 14/21-7/63 70/21-7/21 14/21-35/21 98/21-7/21 14/21-49/21
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