Solutions by everydaycalculation.com
2021 - 1521 is 521.
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Related: 40/21-15/21 20/21-30/21 20/42-15/21 20/21-15/42 60/21-15/21 20/21-45/21 20/63-15/21 20/21-15/63 20/21-75/21
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