Solutions by everydaycalculation.com
18 - 814 is -2556.
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Related: 2/8-8/14 1/8-16/14 1/16-8/14 1/8-8/28 3/8-8/14 1/8-24/14 1/24-8/14 1/8-8/42 5/8-8/14 1/8-40/14 1/40-8/14 1/8-8/70 7/8-8/14 1/8-56/14 1/56-8/14 1/8-8/98
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