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2n+3n+4n=9+27
We move all terms to the left:
2n+3n+4n-(9+27)=0
We add all the numbers together, and all the variables
2n+3n+4n-36=0
We add all the numbers together, and all the variables
9n-36=0
We move all terms containing n to the left, all other terms to the right
9n=36
n=36/9
n=4
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