Solutions by everydaycalculation.com
69 - 89 is -29.
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Related: 12/9-8/9 6/9-16/9 6/18-8/9 6/9-8/18 18/9-8/9 6/9-24/9 6/27-8/9 6/9-8/27 30/9-8/9 6/9-40/9 6/45-8/9 6/9-8/45 42/9-8/9 6/9-56/9 6/63-8/9 6/9-8/63
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