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12=-9n-4-2n+5
We move all terms to the left:
12-(-9n-4-2n+5)=0
We add all the numbers together, and all the variables
-(-11n+1)+12=0
We get rid of parentheses
11n-1+12=0
We add all the numbers together, and all the variables
11n+11=0
We move all terms containing n to the left, all other terms to the right
11n=-11
n=-11/11
n=-1
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