Solutions by everydaycalculation.com
18 - 68 is -58.
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Related: 2/8-6/8 1/8-12/8 1/16-6/8 1/8-6/16 3/8-6/8 1/8-18/8 1/24-6/8 1/8-6/24 5/8-6/8 1/8-30/8 1/40-6/8 1/8-6/40 7/8-6/8 1/8-42/8 1/56-6/8 1/8-6/56
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