Solutions by everydaycalculation.com
18 - 518 is -1172.
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Related: 2/8-5/18 1/8-10/18 1/16-5/18 1/8-5/36 3/8-5/18 1/8-15/18 1/24-5/18 1/8-5/54 5/8-5/18 1/8-25/18 1/40-5/18 1/8-5/90 7/8-5/18 1/8-35/18 1/56-5/18
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