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X+2X=12.X-3X=2
We move all terms to the left:
X+2X-(12.X-3X)=0
We add all the numbers together, and all the variables
X+2X-(+9X)=0
We add all the numbers together, and all the variables
3X-(+9X)=0
We get rid of parentheses
3X-9X=0
We add all the numbers together, and all the variables
-6X=0
X=0/-6
X=0
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