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9(x-3)=3x+9
We move all terms to the left:
9(x-3)-(3x+9)=0
We multiply parentheses
9x-(3x+9)-27=0
We get rid of parentheses
9x-3x-9-27=0
We add all the numbers together, and all the variables
6x-36=0
We move all terms containing x to the left, all other terms to the right
6x=36
x=36/6
x=6
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