Solutions by everydaycalculation.com
1221 - 512 is 1384.
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Related: 24/21-5/12 12/21-10/12 12/42-5/12 12/21-5/24 36/21-5/12 12/21-15/12 12/63-5/12 12/21-5/36 60/21-5/12 12/21-25/12 12/21-5/60 84/21-5/12 12/21-35/12 12/21-5/84
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