Solutions by everydaycalculation.com
1618 - 718 is 12.
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Related: 32/18-7/18 16/18-14/18 16/36-7/18 16/18-7/36 48/18-7/18 16/18-21/18 16/54-7/18 16/18-7/54 80/18-7/18 16/18-35/18 16/90-7/18 16/18-7/90 16/18-49/18
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