Solutions by everydaycalculation.com
212 - 312 is -112.
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Related: 4/12-3/12 2/12-6/12 2/24-3/12 2/12-3/24 6/12-3/12 2/12-9/12 2/36-3/12 2/12-3/36 10/12-3/12 2/12-15/12 2/60-3/12 2/12-3/60 14/12-3/12 2/12-21/12 2/84-3/12 2/12-3/84
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