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-15=6x-3x+9
We move all terms to the left:
-15-(6x-3x+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-24=0
We move all terms containing x to the left, all other terms to the right
-3x=24
x=24/-3
x=-8
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