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X+(2X+40)=180
We move all terms to the left:
X+(2X+40)-(180)=0
We get rid of parentheses
X+2X+40-180=0
We add all the numbers together, and all the variables
3X-140=0
We move all terms containing X to the left, all other terms to the right
3X=140
X=140/3
X=46+2/3
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