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X+(X-30)+(X-30)=180
We move all terms to the left:
X+(X-30)+(X-30)-(180)=0
We get rid of parentheses
X+X+X-30-30-180=0
We add all the numbers together, and all the variables
3X-240=0
We move all terms containing X to the left, all other terms to the right
3X=240
X=240/3
X=80
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