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u+84=2(11u)
We move all terms to the left:
u+84-(2(11u))=0
determiningTheFunctionDomain u-211u+84=0
We add all the numbers together, and all the variables
-210u+84=0
We move all terms containing u to the left, all other terms to the right
-210u=-84
u=-84/-210
u=2/5
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