Solutions by everydaycalculation.com
1st number: 2/8, 2nd number: 1 6/12
28 - 1812 is -54.
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Related: 4/8-18/12 2/8-36/12 2/16-18/12 2/8-18/24 6/8-18/12 2/8-54/12 2/24-18/12 2/8-18/36 10/8-18/12 2/8-90/12 2/40-18/12 2/8-18/60 14/8-18/12 2/56-18/12 2/8-18/84
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