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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
36/27 = x+5/x // - x+5/x
36/27-x-(5/x) = 0
36/27-x-5*x^-1 = 0
4/3*x^0-1*x^1-5*x^-1 = 0
(4/3*x^1-1*x^2-5*x^0)/(x^1) = 0 // * x^2
x^1*(4/3*x^1-1*x^2-5*x^0) = 0
x^1
(4/3)*x-x^2-5 = 0
(4/3)*x-x^2-5 = 0
DELTA = (4/3)^2-(-5*(-1)*4)
DELTA = -164/9
DELTA < 0
x in { }
x belongs to the empty set
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