Solutions by everydaycalculation.com
212 - 812 is -12.
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Related: 4/12-8/12 2/12-16/12 2/24-8/12 2/12-8/24 6/12-8/12 2/12-24/12 2/36-8/12 2/12-8/36 10/12-8/12 2/12-40/12 2/60-8/12 2/12-8/60 14/12-8/12 2/12-56/12 2/84-8/12 2/12-8/84
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