Solutions by everydaycalculation.com
37 - 79 is -2263.
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Related: 6/7-7/9 3/7-14/9 3/14-7/9 3/7-7/18 9/7-7/9 3/7-21/9 3/21-7/9 3/7-7/27 15/7-7/9 3/7-35/9 3/35-7/9 3/7-7/45 21/7-7/9 3/7-49/9 3/49-7/9 3/7-7/63
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