-3u=-81

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Solution for -3u=-81 equation: 



-3u=-81

We move all terms to the left:

-3u-(-81)=0

We add all the numbers together, and all the variables

-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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