Solutions by everydaycalculation.com
18 - 512 is -724.
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Related: 2/8-5/12 1/8-10/12 1/16-5/12 1/8-5/24 3/8-5/12 1/8-15/12 1/24-5/12 1/8-5/36 5/8-5/12 1/8-25/12 1/40-5/12 1/8-5/60 7/8-5/12 1/8-35/12 1/56-5/12 1/8-5/84
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