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27=6n-9
We move all terms to the left:
27-(6n-9)=0
We get rid of parentheses
-6n+9+27=0
We add all the numbers together, and all the variables
-6n+36=0
We move all terms containing n to the left, all other terms to the right
-6n=-36
n=-36/-6
n=+6
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