213=57-u

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Solution for 213=57-u equation: 



213=57-u

We move all terms to the left:

213-(57-u)=0

We add all the numbers together, and all the variables

-(-1u+57)+213=0

We get rid of parentheses

1u-57+213=0

We add all the numbers together, and all the variables

u+156=0

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

u=-156

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