Solutions by everydaycalculation.com
1521 - 121 is 23.
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Related: 30/21-1/21 15/21-2/21 15/42-1/21 15/21-1/42 45/21-1/21 15/21-3/21 15/63-1/21 15/21-1/63 75/21-1/21 15/21-5/21 15/21-7/21
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