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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(2*x)/5-(23/5) = -9/x // + -9/x
(2*x)/5-(-9/x)-(23/5) = 0
(2*x)/5+9*x^-1-23/5 = 0
2/5*x^1+9*x^-1-23/5*x^0 = 0
(2/5*x^2-23/5*x^1+9*x^0)/(x^1) = 0 // * x^2
x^1*(2/5*x^2-23/5*x^1+9*x^0) = 0
x^1
(2/5)*x^2+(-23/5)*x+9 = 0
(2/5)*x^2+(-23/5)*x+9 = 0
DELTA = (-23/5)^2-(4*9*(2/5))
DELTA = 169/25
DELTA > 0
x = ((169/25)^(1/2)-(-23/5))/(2*(2/5)) or x = (-(-23/5)-(169/25)^(1/2))/(2*(2/5))
x = 9 or x = 5/2
x in { 5/2, 9}
x in { 5/2, 9 }
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