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-27=-4n+9n
We move all terms to the left:
-27-(-4n+9n)=0
We add all the numbers together, and all the variables
-(+5n)-27=0
We get rid of parentheses
-5n-27=0
We move all terms containing n to the left, all other terms to the right
-5n=27
n=27/-5
n=-5+2/5
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