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