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(X+2)+(5X+7)+(3X)=180
We move all terms to the left:
(X+2)+(5X+7)+(3X)-(180)=0
We add all the numbers together, and all the variables
3X+(X+2)+(5X+7)-180=0
We get rid of parentheses
3X+X+5X+2+7-180=0
We add all the numbers together, and all the variables
9X-171=0
We move all terms containing X to the left, all other terms to the right
9X=171
X=171/9
X=19
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