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(x+10)^2+x^2=100^2
We move all terms to the left:
(x+10)^2+x^2-(100^2)=0
We add all the numbers together, and all the variables
x^2+(x+10)^2-10000=0
We move all terms containing x to the left, all other terms to the right
x^2+(x+10)^2=10000
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