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-3x^2x-3=6x+9
We move all terms to the left:
-3x^2x-3-(6x+9)=0
We get rid of parentheses
-3x^2x-6x-9-3=0
We add all the numbers together, and all the variables
-3x^2x-6x-12=0
We move all terms containing x to the left, all other terms to the right
-3x^2x-6x=12
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