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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(5/6)*x-(2/3)-18 = 4/x-3 // - 4/x-3
(5/6)*x-(4/x)-(2/3)-18+3 = 0
(5/6)*x-4*x^-1-2/3-18+3 = 0
5/6*x^1-4*x^-1-47/3*x^0 = 0
(5/6*x^2-47/3*x^1-4*x^0)/(x^1) = 0 // * x^2
x^1*(5/6*x^2-47/3*x^1-4*x^0) = 0
x^1
(5/6)*x^2+(-47/3)*x-4 = 0
(5/6)*x^2+(-47/3)*x-4 = 0
DELTA = (-47/3)^2-(-4*4*(5/6))
DELTA = 2329/9
DELTA > 0
x = ((2329/9)^(1/2)-(-47/3))/(2*(5/6)) or x = (-(-47/3)-(2329/9)^(1/2))/(2*(5/6))
x = 3/5*((2329/9)^(1/2)+47/3) or x = 3/5*(47/3-(2329/9)^(1/2))
x in { 3/5*(47/3-(2329/9)^(1/2)), 3/5*((2329/9)^(1/2)+47/3)}
x in { 3/5*(47/3-(2329/9)^(1/2)), 3/5*((2329/9)^(1/2)+47/3) }
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