x+2x=(x+7)+(x+5)

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Solution for x+2x=(x+7)+(x+5) equation: 



x+2x=(x+7)+(x+5)

We move all terms to the left:

x+2x-((x+7)+(x+5))=0

We add all the numbers together, and all the variables

3x-((x+7)+(x+5))=0



We calculate terms in parentheses: -((x+7)+(x+5)), so:

(x+7)+(x+5)

We get rid of parentheses

x+x+7+5

We add all the numbers together, and all the variables

2x+12

Back to the equation:

-(2x+12)



We get rid of parentheses

3x-2x-12=0

We add all the numbers together, and all the variables

x-12=0

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

x=12

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