Solutions by everydaycalculation.com
612 - 812 is -16.
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Related: 6/12-16/12 6/24-8/12 6/12-8/24 18/12-8/12 6/12-24/12 6/36-8/12 6/12-8/36 30/12-8/12 6/12-40/12 6/60-8/12 6/12-8/60 42/12-8/12 6/12-56/12 6/84-8/12 6/12-8/84
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