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2n+(n-3)+(3n-17)=180
We move all terms to the left:
2n+(n-3)+(3n-17)-(180)=0
We get rid of parentheses
2n+n+3n-3-17-180=0
We add all the numbers together, and all the variables
6n-200=0
We move all terms containing n to the left, all other terms to the right
6n=200
n=200/6
n=33+1/3
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