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