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(X+30)+(X+10)+2X=360
We move all terms to the left:
(X+30)+(X+10)+2X-(360)=0
We add all the numbers together, and all the variables
2X+(X+30)+(X+10)-360=0
We get rid of parentheses
2X+X+X+30+10-360=0
We add all the numbers together, and all the variables
4X-320=0
We move all terms containing X to the left, all other terms to the right
4X=320
X=320/4
X=80
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