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18u=9u+18
We move all terms to the left:
18u-(9u+18)=0
We get rid of parentheses
18u-9u-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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