Solutions by everydaycalculation.com
18 - 67 is -4156.
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Related: 2/8-6/7 1/8-12/7 1/16-6/7 1/8-6/14 3/8-6/7 1/8-18/7 1/24-6/7 1/8-6/21 5/8-6/7 1/8-30/7 1/40-6/7 1/8-6/35 7/8-6/7 1/8-42/7 1/56-6/7 1/8-6/49
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