Solutions by everydaycalculation.com
1st number: 1 3/18, 2nd number: 1 12/18
2118 - 3018 is -12.
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Related: 42/18-30/18 21/18-60/18 21/36-30/18 21/18-30/36 63/18-30/18 21/18-90/18 21/54-30/18 21/18-30/54 21/90-30/18 21/18-30/90
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