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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
1/x-(3*x) = -1/3 // + -1/3
1/x-(3*x)-(-1/3) = 0
1/x-3*x+1/3 = 0
1*x^-1-3*x^1+1/3*x^0 = 0
(1/3*x^1-3*x^2+1*x^0)/(x^1) = 0 // * x^2
x^1*(1/3*x^1-3*x^2+1*x^0) = 0
x^1
(1/3)*x-3*x^2+1 = 0
(1/3)*x-3*x^2+1 = 0
DELTA = (1/3)^2-(-3*1*4)
DELTA = 109/9
DELTA > 0
x = ((109/9)^(1/2)-(1/3))/(-3*2) or x = (-(1/3)-(109/9)^(1/2))/(-3*2)
x = ((109/9)^(1/2)-1/3)/(-6) or x = ((109/9)^(1/2)+1/3)/6
x in { ((109/9)^(1/2)-1/3)/(-6), ((109/9)^(1/2)+1/3)/6}
x in { ((109/9)^(1/2)-1/3)/(-6), ((109/9)^(1/2)+1/3)/6 }
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