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X+(2X-10)+(X+30)=180
We move all terms to the left:
X+(2X-10)+(X+30)-(180)=0
We get rid of parentheses
X+2X+X-10+30-180=0
We add all the numbers together, and all the variables
4X-160=0
We move all terms containing X to the left, all other terms to the right
4X=160
X=160/4
X=40
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