Solutions by everydaycalculation.com
1st number: 3 9/18, 2nd number: 4 9/18
6318 - 8118 is -11.
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Related: 63/36-81/18 63/18-81/36 63/54-81/18 63/18-81/54 63/90-81/18 63/18-81/90
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