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X+(2X)+(6X+18)=180
We move all terms to the left:
X+(2X)+(6X+18)-(180)=0
We add all the numbers together, and all the variables
3X+(6X+18)-180=0
We get rid of parentheses
3X+6X+18-180=0
We add all the numbers together, and all the variables
9X-162=0
We move all terms containing X to the left, all other terms to the right
9X=162
X=162/9
X=18
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