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X+X=3X+19
We move all terms to the left:
X+X-(3X+19)=0
We add all the numbers together, and all the variables
2X-(3X+19)=0
We get rid of parentheses
2X-3X-19=0
We add all the numbers together, and all the variables
-1X-19=0
We move all terms containing X to the left, all other terms to the right
-X=19
X=19/-1
X=-19
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