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(X+9)+X+(2X-8)=180
We move all terms to the left:
(X+9)+X+(2X-8)-(180)=0
We add all the numbers together, and all the variables
X+(X+9)+(2X-8)-180=0
We get rid of parentheses
X+X+2X+9-8-180=0
We add all the numbers together, and all the variables
4X-179=0
We move all terms containing X to the left, all other terms to the right
4X=179
X=179/4
X=44+3/4
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