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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
(8/3)*y+7/y+5 = 0
8/3*y^1+7*y^-1+5*y^0 = 0
(8/3*y^2+5*y^1+7*y^0)/(y^1) = 0 // * y^2
y^1*(8/3*y^2+5*y^1+7*y^0) = 0
y^1
(8/3)*y^2+5*y+7 = 0
(8/3)*y^2+5*y+7 = 0
DELTA = 5^2-(4*7*(8/3))
DELTA = -149/3
DELTA < 0
y in { }
y belongs to the empty set
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