Solutions by everydaycalculation.com
1st number: 10/18, 2nd number: 1 4/12
1018 - 1612 is -79.
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Related: 20/18-16/12 10/18-32/12 10/36-16/12 10/18-16/24 30/18-16/12 10/18-48/12 10/54-16/12 10/18-16/36 50/18-16/12 10/18-80/12 10/90-16/12 10/18-16/60 70/18-16/12 10/18-16/84
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