Posted by **JR** on Thursday, October 11, 2012 at 3:18am.

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+7-7=52

5n=45

5n/5=45/9

n=9

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