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(X+120)+(140-X)+X+20=180
We move all terms to the left:
(X+120)+(140-X)+X+20-(180)=0
We add all the numbers together, and all the variables
(X+120)+(-1X+140)+X+20-180=0
We add all the numbers together, and all the variables
X+(X+120)+(-1X+140)-160=0
We get rid of parentheses
X+X-1X+120+140-160=0
We add all the numbers together, and all the variables
X+100=0
We move all terms containing X to the left, all other terms to the right
X=-100
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