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6n-20+5n-11=180-171-n
We move all terms to the left:
6n-20+5n-11-(180-171-n)=0
We add all the numbers together, and all the variables
6n+5n-(-1n+9)-20-11=0
We add all the numbers together, and all the variables
11n-(-1n+9)-31=0
We get rid of parentheses
11n+1n-9-31=0
We add all the numbers together, and all the variables
12n-40=0
We move all terms containing n to the left, all other terms to the right
12n=40
n=40/12
n=3+1/3
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