Solutions by everydaycalculation.com
1st number: 16/18, 2nd number: 1 12/18
1618 - 3018 is -79.
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Related: 32/18-30/18 16/18-60/18 16/36-30/18 16/18-30/36 48/18-30/18 16/18-90/18 16/54-30/18 16/18-30/54 80/18-30/18 16/90-30/18 16/18-30/90
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