90=(3x+10)+x

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Solution for 90=(3x+10)+x equation: 



90=(3x+10)+x

We move all terms to the left:

90-((3x+10)+x)=0



We calculate terms in parentheses: -((3x+10)+x), so:

(3x+10)+x

We add all the numbers together, and all the variables

x+(3x+10)

We get rid of parentheses

x+3x+10

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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