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X=9+3(X)
We move all terms to the left:
X-(9+3(X))=0
We add all the numbers together, and all the variables
X-(3X+9)=0
We get rid of parentheses
X-3X-9=0
We add all the numbers together, and all the variables
-2X-9=0
We move all terms containing X to the left, all other terms to the right
-2X=9
X=9/-2
X=-4+1/2
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