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(x+7)^2+x^2=15^2
We move all terms to the left:
(x+7)^2+x^2-(15^2)=0
We add all the numbers together, and all the variables
x^2+(x+7)^2-225=0
We move all terms containing x to the left, all other terms to the right
x^2+(x+7)^2=225
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