Solutions by everydaycalculation.com
1218 - 1618 is -29.
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Related: 24/18-16/18 12/18-32/18 12/36-16/18 12/18-16/36 36/18-16/18 12/18-48/18 12/54-16/18 12/18-16/54 60/18-16/18 12/18-80/18 12/90-16/18 12/18-16/90 84/18-16/18
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