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-3(n+4)=9-2n
We move all terms to the left:
-3(n+4)-(9-2n)=0
We add all the numbers together, and all the variables
-3(n+4)-(-2n+9)=0
We multiply parentheses
-3n-(-2n+9)-12=0
We get rid of parentheses
-3n+2n-9-12=0
We add all the numbers together, and all the variables
-1n-21=0
We move all terms containing n to the left, all other terms to the right
-n=21
n=21/-1
n=-21
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