Solutions by everydaycalculation.com
47 - 39 is 521.
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Related: 8/7-3/9 4/7-6/9 4/14-3/9 4/7-3/18 12/7-3/9 4/21-3/9 4/7-3/27 20/7-3/9 4/7-15/9 4/35-3/9 4/7-3/45 28/7-3/9 4/7-21/9 4/49-3/9 4/7-3/63
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