Solutions by everydaycalculation.com
1221 - 921 is 17.
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Related: 24/21-9/21 12/21-18/21 12/42-9/21 12/21-9/42 36/21-9/21 12/21-27/21 12/63-9/21 12/21-9/63 60/21-9/21 12/21-45/21 84/21-9/21 12/21-63/21
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