81=6u-3u

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Solution for 81=6u-3u equation: 



81=6u-3u

We move all terms to the left:

81-(6u-3u)=0

We add all the numbers together, and all the variables

-(+3u)+81=0

We get rid of parentheses

-3u+81=0

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

-3u=-81

u=-81/-3

u=+27

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