15=12x-9x

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Solution for 15=12x-9x equation: 



15=12x-9x

We move all terms to the left:

15-(12x-9x)=0

We add all the numbers together, and all the variables

-(+3x)+15=0

We get rid of parentheses

-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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