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(X-11)+X=99
We move all terms to the left:
(X-11)+X-(99)=0
We add all the numbers together, and all the variables
X+(X-11)-99=0
We get rid of parentheses
X+X-11-99=0
We add all the numbers together, and all the variables
2X-110=0
We move all terms containing X to the left, all other terms to the right
2X=110
X=110/2
X=55
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