15=x+3x

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Solution for 15=x+3x equation: 



15=x+3x

We move all terms to the left:

15-(x+3x)=0

We add all the numbers together, and all the variables

-(+4x)+15=0

We get rid of parentheses

-4x+15=0

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

-4x=-15

x=-15/-4

x=3+3/4

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