Solutions by everydaycalculation.com
1st number: 1/8, 2nd number: 1 6/12
18 - 1812 is -118.
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Related: 2/8-18/12 1/8-36/12 1/16-18/12 1/8-18/24 3/8-18/12 1/8-54/12 1/24-18/12 1/8-18/36 5/8-18/12 1/8-90/12 1/40-18/12 1/8-18/60 7/8-18/12 1/56-18/12 1/8-18/84
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