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-6(4n+9)=12n
We move all terms to the left:
-6(4n+9)-(12n)=0
We add all the numbers together, and all the variables
-12n-6(4n+9)=0
We multiply parentheses
-12n-24n-54=0
We add all the numbers together, and all the variables
-36n-54=0
We move all terms containing n to the left, all other terms to the right
-36n=54
n=54/-36
n=-1+1/2
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