213=12-u

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Solution for 213=12-u equation: 



213=12-u

We move all terms to the left:

213-(12-u)=0

We add all the numbers together, and all the variables

-(-1u+12)+213=0

We get rid of parentheses

1u-12+213=0

We add all the numbers together, and all the variables

u+201=0

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

u=-201

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