90=(8x-9)+x

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Solution for 90=(8x-9)+x equation: 



90=(8x-9)+x

We move all terms to the left:

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



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

(8x-9)+x

We add all the numbers together, and all the variables

x+(8x-9)

We get rid of parentheses

x+8x-9

We add all the numbers together, and all the variables

9x-9

Back to the equation:

-(9x-9)



We get rid of parentheses

-9x+9+90=0

We add all the numbers together, and all the variables

-9x+99=0

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

-9x=-99

x=-99/-9

x=+11

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