251=12-u

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Solution for 251=12-u equation: 



251=12-u

We move all terms to the left:

251-(12-u)=0

We add all the numbers together, and all the variables

-(-1u+12)+251=0

We get rid of parentheses

1u-12+251=0

We add all the numbers together, and all the variables

u+239=0

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

u=-239

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