Solutions by everydaycalculation.com
28 - 18 is 18.
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Related: 4/8-1/8 2/8-2/8 2/16-1/8 2/8-1/16 6/8-1/8 2/8-3/8 2/24-1/8 2/8-1/24 10/8-1/8 2/8-5/8 2/40-1/8 2/8-1/40 14/8-1/8 2/8-7/8 2/56-1/8 2/8-1/56
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