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