-12-18=2u+u

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Solution for -12-18=2u+u equation: 



-12-18=2u+u

We move all terms to the left:

-12-18-(2u+u)=0

We add all the numbers together, and all the variables

-(+3u)-12-18=0

We add all the numbers together, and all the variables

-(+3u)-30=0

We get rid of parentheses

-3u-30=0

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

-3u=30

u=30/-3

u=-10

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