81+2u=11u

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Solution for 81+2u=11u equation: 



81+2u=11u

We move all terms to the left:

81+2u-(11u)=0

We add all the numbers together, and all the variables

-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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