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