155=221-u

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Solution for 155=221-u equation: 



155=221-u

We move all terms to the left:

155-(221-u)=0

We add all the numbers together, and all the variables

-(-1u+221)+155=0

We get rid of parentheses

1u-221+155=0

We add all the numbers together, and all the variables

u-66=0

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

u=66

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