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(X+20)+(X+10)+50=180
We move all terms to the left:
(X+20)+(X+10)+50-(180)=0
We add all the numbers together, and all the variables
(X+20)+(X+10)-130=0
We get rid of parentheses
X+X+20+10-130=0
We add all the numbers together, and all the variables
2X-100=0
We move all terms containing X to the left, all other terms to the right
2X=100
X=100/2
X=50
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