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11=9+u/18
We move all terms to the left:
11-(9+u/18)=0
We add all the numbers together, and all the variables
-(u/18+9)+11=0
We get rid of parentheses
-u/18-9+11=0
We multiply all the terms by the denominator
-u-9*18+11*18=0
We add all the numbers together, and all the variables
-1u+36=0
We move all terms containing u to the left, all other terms to the right
-u=-36
u=-36/-1
u=+36
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