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April 18, 2014

April 18, 2014

Posted by **Lisa** on Thursday, October 13, 2011 at 8:35am.

- algebra -
**Ofenbach**, Thursday, October 13, 2011 at 8:39am9 n = 81 Divide both sides with 9

9 n / 9 = 81 / 9

n = 9

9 * 9 = 81

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