Solutions by everydaycalculation.com
15 - 79 is -2645.
Related: 2/5-7/9 1/5-14/9 1/10-7/9 1/5-7/18 3/5-7/9 1/5-21/9 1/15-7/9 1/5-7/27 1/5-35/9 1/25-7/9 1/5-7/45 7/5-7/9 1/5-49/9 1/35-7/9 1/5-7/63
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