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X+2X=18X-2X=2
We move all terms to the left:
X+2X-(18X-2X)=0
We add all the numbers together, and all the variables
X+2X-(+16X)=0
We add all the numbers together, and all the variables
3X-(+16X)=0
We get rid of parentheses
3X-16X=0
We add all the numbers together, and all the variables
-13X=0
X=0/-13
X=0
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