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(4-b)^2-b^2=36
We move all terms to the left:
(4-b)^2-b^2-(36)=0
We add all the numbers together, and all the variables
-b^2+(-1b+4)^2-36=0
We add all the numbers together, and all the variables
-1b^2+(-1b+4)^2-36=0
We move all terms containing b to the left, all other terms to the right
-1b^2+(-1b+4)^2=36
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