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x^2-(28-x)^2=-336
We move all terms to the left:
x^2-(28-x)^2-(-336)=0
We add all the numbers together, and all the variables
x^2-(-1x+28)^2-(-336)=0
We add all the numbers together, and all the variables
x^2-(-1x+28)^2+336=0
We move all terms containing x to the left, all other terms to the right
x^2-(-1x+28)^2=-336
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