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n in (-oo:+oo)
(1/6)*n^4-((5/6)*n^3) = 0
(1/6)*n^4+(-5/6)*n^3 = 0
1/6*n^4-5/6*n^3 = 0
1/6*n^3*(n-5) = 0
n-5 = 0 // + 5
n = 5
(n^3)/6 = 0
1/6*n^3 = 0 // : 1/6
n^3 = 0
n = 0
n in { 5, 0 }
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