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X+(2X-18)+90=180
We move all terms to the left:
X+(2X-18)+90-(180)=0
We add all the numbers together, and all the variables
X+(2X-18)-90=0
We get rid of parentheses
X+2X-18-90=0
We add all the numbers together, and all the variables
3X-108=0
We move all terms containing X to the left, all other terms to the right
3X=108
X=108/3
X=36
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