81=u/9+3

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Solution for 81=u/9+3 equation: 



81=u/9+3

We move all terms to the left:

81-(u/9+3)=0

We get rid of parentheses

-u/9-3+81=0

We multiply all the terms by the denominator


-u-3*9+81*9=0

We add all the numbers together, and all the variables

-1u+702=0

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

-u=-702

u=-702/-1

u=+702

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