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X=511-2X
We move all terms to the left:
X-(511-2X)=0
We add all the numbers together, and all the variables
X-(-2X+511)=0
We get rid of parentheses
X+2X-511=0
We add all the numbers together, and all the variables
3X-511=0
We move all terms containing X to the left, all other terms to the right
3X=511
X=511/3
X=170+1/3
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