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X=100-X
We move all terms to the left:
X-(100-X)=0
We add all the numbers together, and all the variables
X-(-1X+100)=0
We get rid of parentheses
X+1X-100=0
We add all the numbers together, and all the variables
2X-100=0
We move all terms containing X to the left, all other terms to the right
2X=100
X=100/2
X=50
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