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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
1/x+1/x-9 = (19/9)*x-33 // - (19/9)*x-33
1/x-((19/9)*x)+1/x-9+33 = 0
(-19/9)*x+1/x+1/x-9+33 = 0
2*x^-1-19/9*x^1+24*x^0 = 0
(24*x^1-19/9*x^2+2*x^0)/(x^1) = 0 // * x^2
x^1*(24*x^1-19/9*x^2+2*x^0) = 0
x^1
(-19/9)*x^2+24*x+2 = 0
(-19/9)*x^2+24*x+2 = 0
DELTA = 24^2-(2*4*(-19/9))
DELTA = 5336/9
DELTA > 0
x = ((5336/9)^(1/2)-24)/(2*(-19/9)) or x = (-(5336/9)^(1/2)-24)/(2*(-19/9))
x = -9/38*((5336/9)^(1/2)-24) or x = 9/38*((5336/9)^(1/2)+24)
x in { -9/38*((5336/9)^(1/2)-24), 9/38*((5336/9)^(1/2)+24)}
x in { -9/38*((5336/9)^(1/2)-24), 9/38*((5336/9)^(1/2)+24) }
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