90=(4+5x)+(4x+5)

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Solution for 90=(4+5x)+(4x+5) equation: 



90=(4+5x)+(4x+5)

We move all terms to the left:

90-((4+5x)+(4x+5))=0

We add all the numbers together, and all the variables

-((5x+4)+(4x+5))+90=0



We calculate terms in parentheses: -((5x+4)+(4x+5)), so:

(5x+4)+(4x+5)

We get rid of parentheses

5x+4x+4+5

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+81=0

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

-9x=-81

x=-81/-9

x=+9

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