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n in (-oo:+oo)
((12*n^2)/8)*n^2-(20*n) = 0
((12*n^2)/8)*n^2-20*n = 0
3/2*n^4-20*n = 0
n*(3/2*n^3-20) = 0
3/2*n^3 = 20 // : 3/2
n^3 = 40/3
n^3 = 40/3 // ^ 1/3
n = (40/3)^(1/3)
n = 0
n = 0
n in { (40/3)^(1/3), 0 }
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