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(x^2+6x-7)^2/3=9
We move all terms to the left:
(x^2+6x-7)^2/3-(9)=0
We multiply all the terms by the denominator
(x^2+6x-7)^2-9*3=0
We add all the numbers together, and all the variables
(x^2+6x-7)^2-27=0
We move all terms containing x to the left, all other terms to the right
(x^2+6x-7)^2=27
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