Solutions by everydaycalculation.com
27 - 39 is -121.
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Related: 4/7-3/9 2/7-6/9 2/14-3/9 2/7-3/18 6/7-3/9 2/21-3/9 2/7-3/27 10/7-3/9 2/7-15/9 2/35-3/9 2/7-3/45 14/7-3/9 2/7-21/9 2/49-3/9 2/7-3/63
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