Solutions by everydaycalculation.com
728 - 27 is -128.
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Related: 14/28-2/7 7/28-4/7 7/56-2/7 7/28-2/14 21/28-2/7 7/28-6/7 7/84-2/7 7/28-2/21 35/28-2/7 7/28-10/7 7/28-2/35 49/28-2/7 7/28-14/7 7/28-2/49
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