Solutions by everydaycalculation.com
1221 - 16 is 1742.
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Related: 24/21-1/6 12/21-2/6 12/42-1/6 12/21-1/12 36/21-1/6 12/21-3/6 12/63-1/6 12/21-1/18 60/21-1/6 12/21-5/6 12/21-1/30 84/21-1/6 12/21-7/6 12/21-1/42
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