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X-2(-X+9)=9
We move all terms to the left:
X-2(-X+9)-(9)=0
We add all the numbers together, and all the variables
X-2(-1X+9)-9=0
We multiply parentheses
X+2X-18-9=0
We add all the numbers together, and all the variables
3X-27=0
We move all terms containing X to the left, all other terms to the right
3X=27
X=27/3
X=9
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