Solutions by everydaycalculation.com
15 - 89 is -3145.
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Related: 2/5-8/9 1/5-16/9 1/10-8/9 1/5-8/18 3/5-8/9 1/5-24/9 1/15-8/9 1/5-8/27 1/5-40/9 1/25-8/9 1/5-8/45 7/5-8/9 1/5-56/9 1/35-8/9 1/5-8/63
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