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