81=12u-3u

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Solution for 81=12u-3u equation: 



81=12u-3u

We move all terms to the left:

81-(12u-3u)=0

We add all the numbers together, and all the variables

-(+9u)+81=0

We get rid of parentheses

-9u+81=0

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

-9u=-81

u=-81/-9

u=+9

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