Solutions by everydaycalculation.com
45 - 39 is 715.
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Related: 8/5-3/9 4/5-6/9 4/10-3/9 4/5-3/18 12/5-3/9 4/15-3/9 4/5-3/27 20/5-3/9 4/5-15/9 4/25-3/9 4/5-3/45 28/5-3/9 4/5-21/9 4/35-3/9 4/5-3/63
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