216=261-u

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Solution for 216=261-u equation: 



216=261-u

We move all terms to the left:

216-(261-u)=0

We add all the numbers together, and all the variables

-(-1u+261)+216=0

We get rid of parentheses

1u-261+216=0

We add all the numbers together, and all the variables

u-45=0

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

u=45

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