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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
3*n+15/n+2 = 0
3*n^1+15*n^-1+2*n^0 = 0
(3*n^2+2*n^1+15*n^0)/(n^1) = 0 // * n^2
n^1*(3*n^2+2*n^1+15*n^0) = 0
n^1
3*n^2+2*n+15 = 0
3*n^2+2*n+15 = 0
DELTA = 2^2-(3*4*15)
DELTA = -176
DELTA < 0
n in { }
n belongs to the empty set
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