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(16+x)^2+x^2=729
We move all terms to the left:
(16+x)^2+x^2-(729)=0
We add all the numbers together, and all the variables
x^2+(x+16)^2-729=0
We move all terms containing x to the left, all other terms to the right
x^2+(x+16)^2=729
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