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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(1/3)*x+2/x-15-3 = 0
1/3*x^1+2*x^-1-18*x^0 = 0
(1/3*x^2-18*x^1+2*x^0)/(x^1) = 0 // * x^2
x^1*(1/3*x^2-18*x^1+2*x^0) = 0
x^1
(1/3)*x^2-18*x+2 = 0
(1/3)*x^2-18*x+2 = 0
DELTA = (-18)^2-(2*4*(1/3))
DELTA = 964/3
DELTA > 0
x = ((964/3)^(1/2)+18)/(2*(1/3)) or x = (18-(964/3)^(1/2))/(2*(1/3))
x = 3/2*((964/3)^(1/2)+18) or x = 3/2*(18-(964/3)^(1/2))
x in { 3/2*(18-(964/3)^(1/2)), 3/2*((964/3)^(1/2)+18)}
x in { 3/2*(18-(964/3)^(1/2)), 3/2*((964/3)^(1/2)+18) }
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