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(u/3)^2=100
We move all terms to the left:
(u/3)^2-(100)=0
We add all the numbers together, and all the variables
(+u/3)^2-100=0
We multiply all the terms by the denominator
(+u-100*3)^2=0
We add all the numbers together, and all the variables
(u-300)^2=0
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