Solutions by everydaycalculation.com
78 - 68 is 18.
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Related: 14/8-6/8 7/8-12/8 7/16-6/8 7/8-6/16 21/8-6/8 7/8-18/8 7/24-6/8 7/8-6/24 35/8-6/8 7/8-30/8 7/40-6/8 7/8-6/40 49/8-6/8 7/8-42/8 7/56-6/8 7/8-6/56
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