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X-9=3+(2X)
We move all terms to the left:
X-9-(3+(2X))=0
We add all the numbers together, and all the variables
X-(2X+3)-9=0
We get rid of parentheses
X-2X-3-9=0
We add all the numbers together, and all the variables
-1X-12=0
We move all terms containing X to the left, all other terms to the right
-X=12
X=12/-1
X=-12
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