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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
5/6-(1/x) = 3*x+(8/6)*x // - 3*x+(8/6)*x
5/6-(3*x)-((8/6)*x)-(1/x) = 0
(-4/3)*x-3*x-x^-1+5/6 = 0
5/6*x^0-13/3*x^1-1*x^-1 = 0
(5/6*x^1-13/3*x^2-1*x^0)/(x^1) = 0 // * x^2
x^1*(5/6*x^1-13/3*x^2-1*x^0) = 0
x^1
(-13/3)*x^2+(5/6)*x-1 = 0
(-13/3)*x^2+(5/6)*x-1 = 0
DELTA = (5/6)^2-(-1*4*(-13/3))
DELTA = -599/36
DELTA < 0
x in { }
x belongs to the empty set
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