Solutions by everydaycalculation.com
1218 - 1518 is -16.
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Related: 24/18-15/18 12/18-30/18 12/36-15/18 12/18-15/36 36/18-15/18 12/18-45/18 12/54-15/18 12/18-15/54 60/18-15/18 12/18-75/18 12/90-15/18 12/18-15/90 84/18-15/18
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