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(3x+6)^2-(x+6)^2=(3x)^2
We move all terms to the left:
(3x+6)^2-(x+6)^2-((3x)^2)=0
determiningTheFunctionDomain (3x+6)^2-(x+6)^2-3x^2=0
We add all the numbers together, and all the variables
-3x^2+(3x+6)^2-(x+6)^2=0
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