15=x+2x+9

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Solution for 15=x+2x+9 equation: 



15=x+2x+9

We move all terms to the left:

15-(x+2x+9)=0

We add all the numbers together, and all the variables

-(3x+9)+15=0

We get rid of parentheses

-3x-9+15=0

We add all the numbers together, and all the variables

-3x+6=0

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

-3x=-6

x=-6/-3

x=+2

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