Solutions by everydaycalculation.com
818 - 218 is 13.
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Related: 16/18-2/18 8/18-4/18 8/36-2/18 8/18-2/36 24/18-2/18 8/18-6/18 8/54-2/18 8/18-2/54 40/18-2/18 8/18-10/18 8/90-2/18 8/18-2/90 56/18-2/18 8/18-14/18
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