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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
x/3-(1/x)-3 = 0
x/3-x^-1-3 = 0
1/3*x^1-1*x^-1-3*x^0 = 0
(1/3*x^2-3*x^1-1*x^0)/(x^1) = 0 // * x^2
x^1*(1/3*x^2-3*x^1-1*x^0) = 0
x^1
(1/3)*x^2-3*x-1 = 0
(1/3)*x^2-3*x-1 = 0
DELTA = (-3)^2-(-1*4*(1/3))
DELTA = 31/3
DELTA > 0
x = ((31/3)^(1/2)+3)/(2*(1/3)) or x = (3-(31/3)^(1/2))/(2*(1/3))
x = 3/2*((31/3)^(1/2)+3) or x = 3/2*(3-(31/3)^(1/2))
x in { 3/2*(3-(31/3)^(1/2)), 3/2*((31/3)^(1/2)+3)}
x in { 3/2*(3-(31/3)^(1/2)), 3/2*((31/3)^(1/2)+3) }
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