18=11u-9u

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Solution for 18=11u-9u equation: 



18=11u-9u

We move all terms to the left:

18-(11u-9u)=0

We add all the numbers together, and all the variables

-(+2u)+18=0

We get rid of parentheses

-2u+18=0

We move all terms containing u to the left, all other terms to the right

-2u=-18

u=-18/-2

u=+9

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