209=129-u

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Solution for 209=129-u equation: 



209=129-u

We move all terms to the left:

209-(129-u)=0

We add all the numbers together, and all the variables

-(-1u+129)+209=0

We get rid of parentheses

1u-129+209=0

We add all the numbers together, and all the variables

u+80=0

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

u=-80

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