13=2x+x

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Solution for 13=2x+x equation: 



13=2x+x

We move all terms to the left:

13-(2x+x)=0

We add all the numbers together, and all the variables

-(+3x)+13=0

We get rid of parentheses

-3x+13=0

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

-3x=-13

x=-13/-3

x=4+1/3

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