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D( w )
w = 0
w = 0
w = 0
w in (-oo:0) U (0:+oo)
(3/5)*w+5/w = 1 // - 1
(3/5)*w+5/w-1 = 0
3/5*w^1+5*w^-1-1*w^0 = 0
(3/5*w^2-1*w^1+5*w^0)/(w^1) = 0 // * w^2
w^1*(3/5*w^2-1*w^1+5*w^0) = 0
w^1
(3/5)*w^2-w+5 = 0
(3/5)*w^2-w+5 = 0
DELTA = (-1)^2-(4*5*(3/5))
DELTA = -11
DELTA < 0
w in { }
w belongs to the empty set
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