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X+(X+40)+(X-10)=360
We move all terms to the left:
X+(X+40)+(X-10)-(360)=0
We get rid of parentheses
X+X+X+40-10-360=0
We add all the numbers together, and all the variables
3X-330=0
We move all terms containing X to the left, all other terms to the right
3X=330
X=330/3
X=110
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