u=18+2u

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Solution for u=18+2u equation: 



u=18+2u

We move all terms to the left:

u-(18+2u)=0

We add all the numbers together, and all the variables

u-(2u+18)=0

We get rid of parentheses

u-2u-18=0

We add all the numbers together, and all the variables

-1u-18=0

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

-u=18

u=18/-1

u=-18

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