257=121-u

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Solution for 257=121-u equation: 



257=121-u

We move all terms to the left:

257-(121-u)=0

We add all the numbers together, and all the variables

-(-1u+121)+257=0

We get rid of parentheses

1u-121+257=0

We add all the numbers together, and all the variables

u+136=0

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

u=-136

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