x+3x=x+x

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



x+3x=x+x

We move all terms to the left:

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

We add all the numbers together, and all the variables

x+3x-(+2x)=0

We add all the numbers together, and all the variables

4x-(+2x)=0

We get rid of parentheses

4x-2x=0

We add all the numbers together, and all the variables

2x=0

x=0/2

x=0

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