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(17-2y)^2+y^2=289
We move all terms to the left:
(17-2y)^2+y^2-(289)=0
We add all the numbers together, and all the variables
y^2+(-2y+17)^2-289=0
We move all terms containing y to the left, all other terms to the right
y^2+(-2y+17)^2=289
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