Solutions by everydaycalculation.com
1521 - 821 is 13.
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Related: 30/21-8/21 15/21-16/21 15/42-8/21 15/21-8/42 45/21-8/21 15/21-24/21 15/63-8/21 15/21-8/63 75/21-8/21 15/21-40/21 15/21-56/21
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