Solutions by everydaycalculation.com
18 - 15 is -340.
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Related: 2/8-1/5 1/8-2/5 1/16-1/5 1/8-1/10 3/8-1/5 1/8-3/5 1/24-1/5 1/8-1/15 5/8-1/5 1/40-1/5 1/8-1/25 7/8-1/5 1/8-7/5 1/56-1/5 1/8-1/35
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