Solutions by everydaycalculation.com
57 - 89 is -1163.
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Related: 10/7-8/9 5/7-16/9 5/14-8/9 5/7-8/18 15/7-8/9 5/7-24/9 5/21-8/9 5/7-8/27 25/7-8/9 5/7-40/9 5/35-8/9 5/7-8/45 35/7-8/9 5/7-56/9 5/49-8/9 5/7-8/63
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