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X+(X+55)+(X+39)=180
We move all terms to the left:
X+(X+55)+(X+39)-(180)=0
We get rid of parentheses
X+X+X+55+39-180=0
We add all the numbers together, and all the variables
3X-86=0
We move all terms containing X to the left, all other terms to the right
3X=86
X=86/3
X=28+2/3
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