Solutions by everydaycalculation.com
815 - 89 is -1645.
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Related: 16/15-8/9 8/15-16/9 8/30-8/9 8/15-8/18 24/15-8/9 8/15-24/9 8/45-8/9 8/15-8/27 40/15-8/9 8/15-40/9 8/75-8/9 8/15-8/45 56/15-8/9 8/15-56/9 8/15-8/63
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