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X+11+1=2X+12
We move all terms to the left:
X+11+1-(2X+12)=0
We add all the numbers together, and all the variables
X-(2X+12)+12=0
We get rid of parentheses
X-2X-12+12=0
We add all the numbers together, and all the variables
-X=0
X=0/-1
X=0
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