x+x+x+x=(x+3)+(x+3)+(x+3)

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



x+x+x+x=(x+3)+(x+3)+(x+3)

We move all terms to the left:

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

We add all the numbers together, and all the variables

4x-((x+3)+(x+3)+(x+3))=0



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

(x+3)+(x+3)+(x+3)

We get rid of parentheses

x+x+x+3+3+3

We add all the numbers together, and all the variables

3x+9

Back to the equation:

-(3x+9)



We get rid of parentheses

4x-3x-9=0

We add all the numbers together, and all the variables

x-9=0

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

x=9

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