225=81-u

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Solution for 225=81-u equation: 



225=81-u

We move all terms to the left:

225-(81-u)=0

We add all the numbers together, and all the variables

-(-1u+81)+225=0

We get rid of parentheses

1u-81+225=0

We add all the numbers together, and all the variables

u+144=0

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

u=-144

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