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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(1/3)*x-(1/x)+82 = 0
(1/3)*x-x^-1+82 = 0
1/3*x^1-1*x^-1+82*x^0 = 0
(1/3*x^2+82*x^1-1*x^0)/(x^1) = 0 // * x^2
x^1*(1/3*x^2+82*x^1-1*x^0) = 0
x^1
(1/3)*x^2+82*x-1 = 0
(1/3)*x^2+82*x-1 = 0
DELTA = 82^2-(-1*4*(1/3))
DELTA = 20176/3
DELTA > 0
x = ((20176/3)^(1/2)-82)/(2*(1/3)) or x = (-(20176/3)^(1/2)-82)/(2*(1/3))
x = 3/2*((20176/3)^(1/2)-82) or x = -3/2*((20176/3)^(1/2)+82)
x in { -3/2*((20176/3)^(1/2)+82), 3/2*((20176/3)^(1/2)-82)}
x in { -3/2*((20176/3)^(1/2)+82), 3/2*((20176/3)^(1/2)-82) }
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