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December 19, 2014

December 19, 2014

Posted by **JR** on Thursday, October 11, 2012 at 3:23am.

4n+(7+n)=52

4n+(n+7)=52

(4n+n)+7=52

5n+7=52

5n+7-7=52

5n=45

5n/5=45/9

n=9

- math -
**Reiny**, Thursday, October 11, 2012 at 8:35amOh my ....

necessary steps:

4n+(7+n)=52

4n + 7 + n = 52

5n + 7 = 52

5n = 52-7

5n = 45

n = 9

Your 4th last line should have been

5n+7-7 = 52-7 , ( remember "whatever you do to one side, you must do to the other". You didn't )

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