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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
3/5*n^1+1*n^-1 = 0
(3/5*n^2+1*n^0)/(n^1) = 0 // * n^2
n^1*(3/5*n^2+1*n^0) = 0
n^1
(3/5)*n^2+1 = 0
(3/5)*n^2+1 = 0
DELTA = 0^2-(1*4*(3/5))
DELTA = -12/5
DELTA < 0
n in { }
n belongs to the empty set
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