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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
y+5/y = 0
1*y^1+5*y^-1 = 0
(1*y^2+5*y^0)/(y^1) = 0 // * y^2
y^1*(1*y^2+5*y^0) = 0
y^1
y^2+5 = 0
y^2+5 = 0
DELTA = 0^2-(1*4*5)
DELTA = -20
DELTA < 0
y in { }
y belongs to the empty set
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