291=80-u

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Solution for 291=80-u equation: 



291=80-u

We move all terms to the left:

291-(80-u)=0

We add all the numbers together, and all the variables

-(-1u+80)+291=0

We get rid of parentheses

1u-80+291=0

We add all the numbers together, and all the variables

u+211=0

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

u=-211

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