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(9+x)^2+(x+2)^2=17^2

We move all terms to the left:

(9+x)^2+(x+2)^2-(17^2)=0

We add all the numbers together, and all the variables

(x+9)^2+(x+2)^2-17^2=0

We add all the numbers together, and all the variables

(x+9)^2+(x+2)^2-289=0

We move all terms containing x to the left, all other terms to the right

(x+9)^2+(x+2)^2=289

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