Solutions by everydaycalculation.com
1621 - 512 is 2984.
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Related: 32/21-5/12 16/21-10/12 16/42-5/12 16/21-5/24 48/21-5/12 16/21-15/12 16/63-5/12 16/21-5/36 80/21-5/12 16/21-25/12 16/21-5/60 16/21-35/12 16/21-5/84
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