Solutions by everydaycalculation.com
79 - 67 is -563.
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Related: 14/9-6/7 7/9-12/7 7/18-6/7 7/9-6/14 21/9-6/7 7/9-18/7 7/27-6/7 7/9-6/21 35/9-6/7 7/9-30/7 7/45-6/7 7/9-6/35 49/9-6/7 7/9-42/7 7/63-6/7 7/9-6/49
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