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n in (-oo:+oo)
n-((n/3)*n^5)-(((15/9)*n)/15) = 0
(-1/3)*n^6+n+(-1/9)*n = 0
8/9*n-1/3*n^6 = 0
1/3*n*(8/3-n^5) = 0
-1*n^5 = -8/3 // : -1
n^5 = 8/3
n^5 = 8/3 // ^ 1/5
n = (8/3)^(1/5)
n/3 = 0
1/3*n = 0 // : 1/3
n = 0
n in { (8/3)^(1/5), 0 }
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