90=(3x+1)+(x+9)

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Solution for 90=(3x+1)+(x+9) equation: 



90=(3x+1)+(x+9)

We move all terms to the left:

90-((3x+1)+(x+9))=0



We calculate terms in parentheses: -((3x+1)+(x+9)), so:

(3x+1)+(x+9)

We get rid of parentheses

3x+x+1+9

We add all the numbers together, and all the variables

4x+10

Back to the equation:

-(4x+10)



We get rid of parentheses

-4x-10+90=0

We add all the numbers together, and all the variables

-4x+80=0

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

-4x=-80

x=-80/-4

x=+20

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