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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
5/y-y-(2/3)-3 = 0
5/y-y-2/3-3 = 0
5*y^-1-1*y^1-11/3*y^0 = 0
(5*y^0-1*y^2-11/3*y^1)/(y^1) = 0 // * y^2
y^1*(5*y^0-1*y^2-11/3*y^1) = 0
y^1
(-11/3)*y-y^2+5 = 0
(-11/3)*y-y^2+5 = 0
DELTA = (-11/3)^2-(-1*4*5)
DELTA = 301/9
DELTA > 0
y = ((301/9)^(1/2)-(-11/3))/(-1*2) or y = (-(-11/3)-(301/9)^(1/2))/(-1*2)
y = ((301/9)^(1/2)+11/3)/(-2) or y = (11/3-(301/9)^(1/2))/(-2)
y in { ((301/9)^(1/2)+11/3)/(-2), (11/3-(301/9)^(1/2))/(-2)}
y in { ((301/9)^(1/2)+11/3)/(-2), (11/3-(301/9)^(1/2))/(-2) }
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