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(n^2+2)^2-4(n^2+2)-12=0
We multiply parentheses
-4n^2+(n^2+2)^2-8-12=0
We add all the numbers together, and all the variables
-4n^2+(n^2+2)^2-20=0
We move all terms containing n to the left, all other terms to the right
-4n^2+(n^2+2)^2=20
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