90=9(u+8)

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Solution for 90=9(u+8) equation: 



90=9(u+8)

We move all terms to the left:

90-(9(u+8))=0



We calculate terms in parentheses: -(9(u+8)), so:

9(u+8)

We multiply parentheses

9u+72

Back to the equation:

-(9u+72)



We get rid of parentheses

-9u-72+90=0

We add all the numbers together, and all the variables

-9u+18=0

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

-9u=-18

u=-18/-9

u=+2

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