Solutions by everydaycalculation.com
18 - 212 is -124.
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Related: 2/8-2/12 1/8-4/12 1/16-2/12 1/8-2/24 3/8-2/12 1/8-6/12 1/24-2/12 1/8-2/36 5/8-2/12 1/8-10/12 1/40-2/12 1/8-2/60 7/8-2/12 1/8-14/12 1/56-2/12 1/8-2/84
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