90=(x+42)+(2x)

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Solution for 90=(x+42)+(2x) equation: 



90=(x+42)+(2x)

We move all terms to the left:

90-((x+42)+(2x))=0



We calculate terms in parentheses: -((x+42)+2x), so:

(x+42)+2x

We add all the numbers together, and all the variables

2x+(x+42)

We get rid of parentheses

2x+x+42

We add all the numbers together, and all the variables

3x+42

Back to the equation:

-(3x+42)



We get rid of parentheses

-3x-42+90=0

We add all the numbers together, and all the variables

-3x+48=0

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

-3x=-48

x=-48/-3

x=+16

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