15=3x-15+9x

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Solution for 15=3x-15+9x equation: 



15=3x-15+9x

We move all terms to the left:

15-(3x-15+9x)=0

We add all the numbers together, and all the variables

-(12x-15)+15=0

We get rid of parentheses

-12x+15+15=0

We add all the numbers together, and all the variables

-12x+30=0

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

-12x=-30

x=-30/-12

x=2+1/2

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