90=(6x+13)+(3x-4)

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Solution for 90=(6x+13)+(3x-4) equation: 



90=(6x+13)+(3x-4)

We move all terms to the left:

90-((6x+13)+(3x-4))=0



We calculate terms in parentheses: -((6x+13)+(3x-4)), so:

(6x+13)+(3x-4)

We get rid of parentheses

6x+3x+13-4

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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