285=80-u

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Solution for 285=80-u equation: 



285=80-u

We move all terms to the left:

285-(80-u)=0

We add all the numbers together, and all the variables

-(-1u+80)+285=0

We get rid of parentheses

1u-80+285=0

We add all the numbers together, and all the variables

u+205=0

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

u=-205

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