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X+(X+10)+2X+20=210
We move all terms to the left:
X+(X+10)+2X+20-(210)=0
We add all the numbers together, and all the variables
3X+(X+10)-190=0
We get rid of parentheses
3X+X+10-190=0
We add all the numbers together, and all the variables
4X-180=0
We move all terms containing X to the left, all other terms to the right
4X=180
X=180/4
X=45
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