81=23-u

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Solution for 81=23-u equation: 



81=23-u

We move all terms to the left:

81-(23-u)=0

We add all the numbers together, and all the variables

-(-1u+23)+81=0

We get rid of parentheses

1u-23+81=0

We add all the numbers together, and all the variables

u+58=0

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

u=-58

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