-u+21=255

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Solution for -u+21=255 equation: 



-u+21=255

We move all terms to the left:

-u+21-(255)=0

We add all the numbers together, and all the variables

-1u-234=0

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

-u=234

u=234/-1

u=-234

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