81=1-8u

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Solution for 81=1-8u equation: 



81=1-8u

We move all terms to the left:

81-(1-8u)=0

We add all the numbers together, and all the variables

-(-8u+1)+81=0

We get rid of parentheses

8u-1+81=0

We add all the numbers together, and all the variables

8u+80=0

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

8u=-80

u=-80/8

u=-10

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