Solutions by everydaycalculation.com
1st number: 15/18, 2nd number: 3 9/18
1518 - 6318 is -83.
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Related: 30/18-63/18 15/36-63/18 15/18-63/36 45/18-63/18 15/54-63/18 15/18-63/54 75/18-63/18 15/90-63/18 15/18-63/90
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