Solutions by everydaycalculation.com
1st number: 16/18, 2nd number: 1 4/12
1618 - 1612 is -49.
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Related: 32/18-16/12 16/18-32/12 16/36-16/12 16/18-16/24 48/18-16/12 16/18-48/12 16/54-16/12 16/18-16/36 80/18-16/12 16/18-80/12 16/90-16/12 16/18-16/60 16/18-16/84
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