Solutions by everydaycalculation.com
67 - 89 is -263.
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Related: 12/7-8/9 6/7-16/9 6/14-8/9 6/7-8/18 18/7-8/9 6/7-24/9 6/21-8/9 6/7-8/27 30/7-8/9 6/7-40/9 6/35-8/9 6/7-8/45 42/7-8/9 6/7-56/9 6/49-8/9 6/7-8/63
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