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D( y )
y^2 = 0
y^2 = 0
y^2 = 0
1*y^2 = 0 // : 1
y^2 = 0
y = 0
y in (-oo:0) U (0:+oo)
6*y+(2*y)/(y^2) = 0
6*y^1+2*y^-1 = 0
(6*y^2+2*y^0)/(y^1) = 0 // * y^2
y^1*(6*y^2+2*y^0) = 0
y^1
6*y^2+2 = 0
6*y^2+2 = 0
DELTA = 0^2-(2*4*6)
DELTA = -48
DELTA < 0
y in { }
y belongs to the empty set
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