(x-20)^2=x^2-20

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Solution for (x-20)^2=x^2-20 equation: 



(x-20)^2=x^2-20

We move all terms to the left:

(x-20)^2-(x^2-20)=0

We get rid of parentheses

-x^2+(x-20)^2+20=0

We add all the numbers together, and all the variables

-1x^2+(x-20)^2+20=0

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

-1x^2+(x-20)^2=-20

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