Solutions by everydaycalculation.com
17 - 89 is -4763.
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Related: 2/7-8/9 1/7-16/9 1/14-8/9 1/7-8/18 3/7-8/9 1/7-24/9 1/21-8/9 1/7-8/27 5/7-8/9 1/7-40/9 1/35-8/9 1/7-8/45 1/7-56/9 1/49-8/9 1/7-8/63
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