Solutions by everydaycalculation.com
89 - 19 is 79.
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Related: 16/9-1/9 8/9-2/9 8/18-1/9 8/9-1/18 24/9-1/9 8/9-3/9 8/27-1/9 8/9-1/27 40/9-1/9 8/9-5/9 8/45-1/9 8/9-1/45 56/9-1/9 8/9-7/9 8/63-1/9 8/9-1/63
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