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(12x+20)^2+(48-5x)^2=4225
We move all terms to the left:
(12x+20)^2+(48-5x)^2-(4225)=0
We add all the numbers together, and all the variables
(12x+20)^2+(-5x+48)^2-4225=0
We move all terms containing x to the left, all other terms to the right
(12x+20)^2+(-5x+48)^2=4225
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