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(20+x)^2+144=900
We move all terms to the left:
(20+x)^2+144-(900)=0
We add all the numbers together, and all the variables
(x+20)^2+144-900=0
We add all the numbers together, and all the variables
(x+20)^2-756=0
We move all terms containing x to the left, all other terms to the right
(x+20)^2=756
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