258=102-u

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Solution for 258=102-u equation: 



258=102-u

We move all terms to the left:

258-(102-u)=0

We add all the numbers together, and all the variables

-(-1u+102)+258=0

We get rid of parentheses

1u-102+258=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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