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X=100+2X
We move all terms to the left:
X-(100+2X)=0
We add all the numbers together, and all the variables
X-(2X+100)=0
We get rid of parentheses
X-2X-100=0
We add all the numbers together, and all the variables
-1X-100=0
We move all terms containing X to the left, all other terms to the right
-X=100
X=100/-1
X=-100
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