Solutions by everydaycalculation.com
1521 - 921 is 27.
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Related: 30/21-9/21 15/21-18/21 15/42-9/21 15/21-9/42 45/21-9/21 15/21-27/21 15/63-9/21 15/21-9/63 75/21-9/21 15/21-45/21 15/21-63/21
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