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X=X-3+X-8
We move all terms to the left:
X-(X-3+X-8)=0
We add all the numbers together, and all the variables
X-(2X-11)=0
We get rid of parentheses
X-2X+11=0
We add all the numbers together, and all the variables
-1X+11=0
We move all terms containing X to the left, all other terms to the right
-X=-11
X=-11/-1
X=+11
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