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X+(X-2)+(X-4)=20
We move all terms to the left:
X+(X-2)+(X-4)-(20)=0
We get rid of parentheses
X+X+X-2-4-20=0
We add all the numbers together, and all the variables
3X-26=0
We move all terms containing X to the left, all other terms to the right
3X=26
X=26/3
X=8+2/3
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