Solutions by everydaycalculation.com
18 - 79 is -4772.
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Related: 2/8-7/9 1/8-14/9 1/16-7/9 1/8-7/18 3/8-7/9 1/8-21/9 1/24-7/9 1/8-7/27 5/8-7/9 1/8-35/9 1/40-7/9 1/8-7/45 7/8-7/9 1/8-49/9 1/56-7/9 1/8-7/63
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