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