Posted by JR on Thursday, October 11, 2012 at 3:23am.
JUSTIFIES A STEP IN THE SOLUTION OF AN EQUATION
4n+(7+n)=52
4n+(n+7)=52
(4n+n)+7=52
5n+7=52
5n+77=52
5n=45
5n/5=45/9
n=9

math  Reiny, Thursday, October 11, 2012 at 8:35am
Oh my ....
necessary steps:
4n+(7+n)=52
4n + 7 + n = 52
5n + 7 = 52
5n = 527
5n = 45
n = 9
Your 4th last line should have been
5n+77 = 527 , ( remember "whatever you do to one side, you must do to the other". You didn't )
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