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