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(10-x)^2-x^2=-340
We move all terms to the left:
(10-x)^2-x^2-(-340)=0
We add all the numbers together, and all the variables
-x^2+(-1x+10)^2-(-340)=0
We add all the numbers together, and all the variables
-1x^2+(-1x+10)^2+340=0
We move all terms containing x to the left, all other terms to the right
-1x^2+(-1x+10)^2=-340
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