90=(x+42)+3x

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



90=(x+42)+3x

We move all terms to the left:

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



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

(x+42)+3x

We add all the numbers together, and all the variables

3x+(x+42)

We get rid of parentheses

3x+x+42

We add all the numbers together, and all the variables

4x+42

Back to the equation:

-(4x+42)



We get rid of parentheses

-4x-42+90=0

We add all the numbers together, and all the variables

-4x+48=0

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

-4x=-48

x=-48/-4

x=+12

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