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(x-3)^2=(x+6)(x-6)
We move all terms to the left:
(x-3)^2-((x+6)(x-6))=0
We use the square of the difference formula
x^2+(x-3)^2+36=0
We move all terms containing x to the left, all other terms to the right
x^2+(x-3)^2=-36
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