Solutions by everydaycalculation.com
1st number: 16/18, 2nd number: 1 7/18
1618 - 2518 is -12.
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Related: 32/18-25/18 16/18-50/18 16/36-25/18 16/18-25/36 48/18-25/18 16/18-75/18 16/54-25/18 16/18-25/54 80/18-25/18 16/90-25/18 16/18-25/90
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