Solutions by everydaycalculation.com
17 - 79 is -4063.
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Related: 2/7-7/9 1/7-14/9 1/14-7/9 1/7-7/18 3/7-7/9 1/7-21/9 1/21-7/9 1/7-7/27 5/7-7/9 1/7-35/9 1/35-7/9 1/7-7/45 1/7-49/9 1/49-7/9 1/7-7/63
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