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