Solutions by everydaycalculation.com
712 - 212 is 512.
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Related: 14/12-2/12 7/12-4/12 7/24-2/12 7/12-2/24 21/12-2/12 7/12-6/12 7/36-2/12 7/12-2/36 35/12-2/12 7/12-10/12 7/60-2/12 7/12-2/60 49/12-2/12 7/12-14/12 7/84-2/12 7/12-2/84
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