3x=(x+42)=90

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



3x=(x+42)=90

We move all terms to the left:

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



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

(x+42)

We get rid of parentheses

x+42

Back to the equation:

-(x+42)



We get rid of parentheses

3x-x-42=0

We add all the numbers together, and all the variables

2x-42=0

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

2x=42

x=42/2

x=21

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