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12^2=x(3x)
We move all terms to the left:
12^2-(x(3x))=0
determiningTheFunctionDomain -x3x+12^2=0
We add all the numbers together, and all the variables
-x3x+144=0
We move all terms containing x to the left, all other terms to the right
-x3x=-144
x=-144/1
x=-144
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