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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
(5/3)*y+6/y = 2 // - 2
(5/3)*y+6/y-2 = 0
5/3*y^1+6*y^-1-2*y^0 = 0
(5/3*y^2-2*y^1+6*y^0)/(y^1) = 0 // * y^2
y^1*(5/3*y^2-2*y^1+6*y^0) = 0
y^1
(5/3)*y^2-2*y+6 = 0
(5/3)*y^2-2*y+6 = 0
DELTA = (-2)^2-(4*6*(5/3))
DELTA = -36
DELTA < 0
y in { }
y belongs to the empty set
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