Solutions by everydaycalculation.com
1418 - 1618 is -19.
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Related: 28/18-16/18 14/18-32/18 14/36-16/18 14/18-16/36 42/18-16/18 14/18-48/18 14/54-16/18 14/18-16/54 70/18-16/18 14/18-80/18 14/90-16/18 14/18-16/90 98/18-16/18
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