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(X+10)+80+(X-20)=180
We move all terms to the left:
(X+10)+80+(X-20)-(180)=0
We add all the numbers together, and all the variables
(X+10)+(X-20)-100=0
We get rid of parentheses
X+X+10-20-100=0
We add all the numbers together, and all the variables
2X-110=0
We move all terms containing X to the left, all other terms to the right
2X=110
X=110/2
X=55
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