Solutions by everydaycalculation.com
1621 - 312 is 4384.
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Related: 32/21-3/12 16/21-6/12 16/42-3/12 16/21-3/24 48/21-3/12 16/21-9/12 16/63-3/12 16/21-3/36 80/21-3/12 16/21-15/12 16/21-3/60 16/21-21/12 16/21-3/84
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