-80=1-9u

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Solution for -80=1-9u equation: 



-80=1-9u

We move all terms to the left:

-80-(1-9u)=0

We add all the numbers together, and all the variables

-(-9u+1)-80=0

We get rid of parentheses

9u-1-80=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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