Solutions by everydaycalculation.com
1st number: 16/18, 2nd number: 2 6/18
1618 - 4218 is -139.
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Related: 32/18-42/18 16/18-84/18 16/36-42/18 16/18-42/36 48/18-42/18 16/54-42/18 16/18-42/54 80/18-42/18 16/90-42/18 16/18-42/90
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