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