u+18=3u

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Solution for u+18=3u equation: 



u+18=3u

We move all terms to the left:

u+18-(3u)=0

We add all the numbers together, and all the variables

-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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