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X-4=-X
We move all terms to the left:
X-4-(-X)=0
We add all the numbers together, and all the variables
X-(-1X)-4=0
We get rid of parentheses
X+1X-4=0
We add all the numbers together, and all the variables
2X-4=0
We move all terms containing X to the left, all other terms to the right
2X=4
X=4/2
X=2
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