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-13n-9=11-12n
We move all terms to the left:
-13n-9-(11-12n)=0
We add all the numbers together, and all the variables
-13n-(-12n+11)-9=0
We get rid of parentheses
-13n+12n-11-9=0
We add all the numbers together, and all the variables
-1n-20=0
We move all terms containing n to the left, all other terms to the right
-n=20
n=20/-1
n=-20
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