Solutions by everydaycalculation.com
47 - 89 is -2063.
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Related: 8/7-8/9 4/7-16/9 4/14-8/9 4/7-8/18 12/7-8/9 4/7-24/9 4/21-8/9 4/7-8/27 20/7-8/9 4/7-40/9 4/35-8/9 4/7-8/45 28/7-8/9 4/7-56/9 4/49-8/9 4/7-8/63
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