Solutions by everydaycalculation.com
1621 - 321 is 1321.
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Related: 32/21-3/21 16/21-6/21 16/42-3/21 16/21-3/42 48/21-3/21 16/21-9/21 16/63-3/21 16/21-3/63 80/21-3/21 16/21-15/21
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