Solutions by everydaycalculation.com
1821 - 1521 is 17.
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Related: 36/21-15/21 18/21-30/21 18/42-15/21 18/21-15/42 54/21-15/21 18/21-45/21 18/63-15/21 18/21-15/63 90/21-15/21 18/21-75/21
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