72=255-u

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Solution for 72=255-u equation: 



72=255-u

We move all terms to the left:

72-(255-u)=0

We add all the numbers together, and all the variables

-(-1u+255)+72=0

We get rid of parentheses

1u-255+72=0

We add all the numbers together, and all the variables

u-183=0

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

u=183

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