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X=39+2X+2X
We move all terms to the left:
X-(39+2X+2X)=0
We add all the numbers together, and all the variables
X-(4X+39)=0
We get rid of parentheses
X-4X-39=0
We add all the numbers together, and all the variables
-3X-39=0
We move all terms containing X to the left, all other terms to the right
-3X=39
X=39/-3
X=-13
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