Solutions by everydaycalculation.com
79 - 89 is -19.
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Related: 14/9-8/9 7/9-16/9 7/18-8/9 7/9-8/18 21/9-8/9 7/9-24/9 7/27-8/9 7/9-8/27 35/9-8/9 7/9-40/9 7/45-8/9 7/9-8/45 49/9-8/9 7/9-56/9 7/63-8/9 7/9-8/63
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