90=(3x+42)+3x

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Solution for 90=(3x+42)+3x equation: 



90=(3x+42)+3x

We move all terms to the left:

90-((3x+42)+3x)=0



We calculate terms in parentheses: -((3x+42)+3x), so:

(3x+42)+3x

We add all the numbers together, and all the variables

3x+(3x+42)

We get rid of parentheses

3x+3x+42

We add all the numbers together, and all the variables

6x+42

Back to the equation:

-(6x+42)



We get rid of parentheses

-6x-42+90=0

We add all the numbers together, and all the variables

-6x+48=0

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

-6x=-48

x=-48/-6

x=+8

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