Solutions by everydaycalculation.com
1221 - 521 is 13.
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Related: 24/21-5/21 12/21-10/21 12/42-5/21 12/21-5/42 36/21-5/21 12/21-15/21 12/63-5/21 12/21-5/63 60/21-5/21 12/21-25/21 84/21-5/21 12/21-35/21
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