90=3(u+9)

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Solution for 90=3(u+9) equation: 



90=3(u+9)

We move all terms to the left:

90-(3(u+9))=0



We calculate terms in parentheses: -(3(u+9)), so:

3(u+9)

We multiply parentheses

3u+27

Back to the equation:

-(3u+27)



We get rid of parentheses

-3u-27+90=0

We add all the numbers together, and all the variables

-3u+63=0

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

-3u=-63

u=-63/-3

u=+21

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