Solutions by everydaycalculation.com
49 - 79 is -13.
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Related: 8/9-7/9 4/9-14/9 4/18-7/9 4/9-7/18 12/9-7/9 4/9-21/9 4/27-7/9 4/9-7/27 20/9-7/9 4/9-35/9 4/45-7/9 4/9-7/45 28/9-7/9 4/9-49/9 4/63-7/9 4/9-7/63
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