Solutions by everydaycalculation.com
47 - 79 is -1363.
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Related: 8/7-7/9 4/7-14/9 4/14-7/9 4/7-7/18 12/7-7/9 4/7-21/9 4/21-7/9 4/7-7/27 20/7-7/9 4/7-35/9 4/35-7/9 4/7-7/45 28/7-7/9 4/7-49/9 4/49-7/9 4/7-7/63
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