Solutions by everydaycalculation.com
1st number: 16/18, 2nd number: 1 3/18
1618 - 2118 is -518.
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Related: 32/18-21/18 16/18-42/18 16/36-21/18 16/18-21/36 48/18-21/18 16/18-63/18 16/54-21/18 16/18-21/54 80/18-21/18 16/90-21/18 16/18-21/90
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