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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
y+2/y = 5/3 // - 5/3
y+2/y-(5/3) = 0
y+2/y-5/3 = 0
1*y^1+2*y^-1-5/3*y^0 = 0
(1*y^2-5/3*y^1+2*y^0)/(y^1) = 0 // * y^2
y^1*(1*y^2-5/3*y^1+2*y^0) = 0
y^1
y^2+(-5/3)*y+2 = 0
y^2+(-5/3)*y+2 = 0
DELTA = (-5/3)^2-(1*2*4)
DELTA = -47/9
DELTA < 0
y in { }
y belongs to the empty set
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