8u=81-u

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Solution for 8u=81-u equation: 



8u=81-u

We move all terms to the left:

8u-(81-u)=0

We add all the numbers together, and all the variables

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

We get rid of parentheses

8u+1u-81=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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