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18/u=9
We move all terms to the left:
18/u-(9)=0
Domain of the equation: u!=0We multiply all the terms by the denominator
u∈R
-9*u+18=0
We add all the numbers together, and all the variables
-9u+18=0
We move all terms containing u to the left, all other terms to the right
-9u=-18
u=-18/-9
u=+2
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