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3x-9+3x=3+6x-12
We move all terms to the left:
3x-9+3x-(3+6x-12)=0
We add all the numbers together, and all the variables
3x+3x-(6x-9)-9=0
We add all the numbers together, and all the variables
6x-(6x-9)-9=0
We get rid of parentheses
6x-6x+9-9=0
We add all the numbers together, and all the variables
=0
x=0/1
x=0
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