x+15=3x+x

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Solution for x+15=3x+x equation: 



x+15=3x+x

We move all terms to the left:

x+15-(3x+x)=0

We add all the numbers together, and all the variables

x-(+4x)+15=0

We get rid of parentheses

x-4x+15=0

We add all the numbers together, and all the variables

-3x+15=0

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

-3x=-15

x=-15/-3

x=+5

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