Solutions by everydaycalculation.com
1421 - 921 is 521.
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Related: 28/21-9/21 14/21-18/21 14/42-9/21 14/21-9/42 42/21-9/21 14/21-27/21 14/63-9/21 14/21-9/63 70/21-9/21 14/21-45/21 98/21-9/21 14/21-63/21
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