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266=2X-X
We move all terms to the left:
266-(2X-X)=0
We add all the numbers together, and all the variables
-(+X)+266=0
We get rid of parentheses
-X+266=0
We add all the numbers together, and all the variables
-1X+266=0
We move all terms containing X to the left, all other terms to the right
-X=-266
X=-266/-1
X=+266
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