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X+(X+126)=180
We move all terms to the left:
X+(X+126)-(180)=0
We get rid of parentheses
X+X+126-180=0
We add all the numbers together, and all the variables
2X-54=0
We move all terms containing X to the left, all other terms to the right
2X=54
X=54/2
X=27
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