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7n+4n-8-3n^2n=30
We move all terms to the left:
7n+4n-8-3n^2n-(30)=0
We add all the numbers together, and all the variables
-3n^2n+11n-38=0
We move all terms containing n to the left, all other terms to the right
-3n^2n+11n=38
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