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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
1/n = (1/5)*n-n-((1/5)*n) // - (1/5)*n-n-((1/5)*n)
n-((1/5)*n)+(1/5)*n+1/n = 0
(-1/5)*n+n+(1/5)*n+1/n = 0
1*n^1+1*n^-1 = 0
(1*n^2+1*n^0)/(n^1) = 0 // * n^2
n^1*(1*n^2+1*n^0) = 0
n^1
n^2+1 = 0
n^2+1 = 0
DELTA = 0^2-(1*1*4)
DELTA = -4
DELTA < 0
n in { }
n belongs to the empty set
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