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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
7/3 = 2*x+5/x // - 2*x+5/x
7/3-(2*x)-(5/x) = 0
7/3-2*x-5*x^-1 = 0
7/3*x^0-2*x^1-5*x^-1 = 0
(7/3*x^1-2*x^2-5*x^0)/(x^1) = 0 // * x^2
x^1*(7/3*x^1-2*x^2-5*x^0) = 0
x^1
(7/3)*x-2*x^2-5 = 0
(7/3)*x-2*x^2-5 = 0
DELTA = (7/3)^2-(-5*(-2)*4)
DELTA = -311/9
DELTA < 0
x in { }
x belongs to the empty set
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