Solutions by everydaycalculation.com
1st number: 12/18, 2nd number: 1 6/18
1218 - 2418 is -23.
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Related: 24/18-24/18 12/18-48/18 12/36-24/18 12/18-24/36 36/18-24/18 12/18-72/18 12/54-24/18 12/18-24/54 60/18-24/18 12/90-24/18 12/18-24/90 84/18-24/18
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