Solutions by everydaycalculation.com
89 - 78 is 172.
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Related: 16/9-7/8 8/9-14/8 8/18-7/8 8/9-7/16 24/9-7/8 8/9-21/8 8/27-7/8 8/9-7/24 40/9-7/8 8/9-35/8 8/45-7/8 8/9-7/40 56/9-7/8 8/9-49/8 8/63-7/8 8/9-7/56
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