x+3x=(x+7)

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Solution for x+3x=(x+7) equation: 



x+3x=(x+7)

We move all terms to the left:

x+3x-((x+7))=0

We add all the numbers together, and all the variables

4x-((x+7))=0



We calculate terms in parentheses: -((x+7)), so:

(x+7)

We get rid of parentheses

x+7

Back to the equation:

-(x+7)



We get rid of parentheses

4x-x-7=0

We add all the numbers together, and all the variables

3x-7=0

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

3x=7

x=7/3

x=2+1/3

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