Homework Help: math

Posted by john on Monday, September 3, 2012 at 4:31pm.

a=7-3a. for example 2=7-3(2)=1. if 6-x=2-x, find the value of x. the problem i am having is that the first a is in a square box and the first 2 is in a squre box. so does 6 and -x in a square box. I am not sure what the boxes represent?

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