Solutions by everydaycalculation.com
212 - 612 is -13.
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Related: 4/12-6/12 2/24-6/12 2/12-6/24 6/12-6/12 2/12-18/12 2/36-6/12 2/12-6/36 10/12-6/12 2/12-30/12 2/60-6/12 2/12-6/60 14/12-6/12 2/12-42/12 2/84-6/12 2/12-6/84
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