u+18=3u-18

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Solution for u+18=3u-18 equation: 



u+18=3u-18

We move all terms to the left:

u+18-(3u-18)=0

We get rid of parentheses

u-3u+18+18=0

We add all the numbers together, and all the variables

-2u+36=0

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

-2u=-36

u=-36/-2

u=+18

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