Solutions by everydaycalculation.com
18 - 17 is -156.
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Related: 2/8-1/7 1/8-2/7 1/16-1/7 1/8-1/14 3/8-1/7 1/8-3/7 1/24-1/7 1/8-1/21 5/8-1/7 1/8-5/7 1/40-1/7 1/8-1/35 7/8-1/7 1/56-1/7 1/8-1/49
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