Solutions by everydaycalculation.com
1st number: 6/12, 2nd number: 1 6/12
612 - 1812 is -11.
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Related: 6/12-36/12 6/24-18/12 6/12-18/24 18/12-18/12 6/12-54/12 6/36-18/12 6/12-18/36 30/12-18/12 6/12-90/12 6/60-18/12 6/12-18/60 42/12-18/12 6/84-18/12 6/12-18/84
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