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28+18n-36+3n^2-12n+12=3n^2+6n+4
We move all terms to the left:
28+18n-36+3n^2-12n+12-(3n^2+6n+4)=0
We add all the numbers together, and all the variables
3n^2+6n-(3n^2+6n+4)+4=0
We get rid of parentheses
3n^2-3n^2+6n-6n-4+4=0
We add all the numbers together, and all the variables
=0
n=0/1
n=0
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