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(X-9)+(3X+1)=180
We move all terms to the left:
(X-9)+(3X+1)-(180)=0
We get rid of parentheses
X+3X-9+1-180=0
We add all the numbers together, and all the variables
4X-188=0
We move all terms containing X to the left, all other terms to the right
4X=188
X=188/4
X=47
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