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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
23/3-((10*x)/3)-(4/x) = 0
(-10/3)*x-4*x^-1+23/3 = 0
23/3*x^0-10/3*x^1-4*x^-1 = 0
(23/3*x^1-10/3*x^2-4*x^0)/(x^1) = 0 // * x^2
x^1*(23/3*x^1-10/3*x^2-4*x^0) = 0
x^1
(-10/3)*x^2+(23/3)*x-4 = 0
(-10/3)*x^2+(23/3)*x-4 = 0
DELTA = (23/3)^2-(-4*4*(-10/3))
DELTA = 49/9
DELTA > 0
x = ((49/9)^(1/2)-(23/3))/(2*(-10/3)) or x = (-(23/3)-(49/9)^(1/2))/(2*(-10/3))
x = 4/5 or x = 3/2
x in { 4/5, 3/2}
x in { 4/5, 3/2 }
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