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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
1/6-(1/x) = (5/8)*x // - (5/8)*x
1/6-((5/8)*x)-(1/x) = 0
(-5/8)*x-x^-1+1/6 = 0
1/6*x^0-5/8*x^1-1*x^-1 = 0
(1/6*x^1-5/8*x^2-1*x^0)/(x^1) = 0 // * x^2
x^1*(1/6*x^1-5/8*x^2-1*x^0) = 0
x^1
(-5/8)*x^2+(1/6)*x-1 = 0
(-5/8)*x^2+(1/6)*x-1 = 0
DELTA = (1/6)^2-(-1*4*(-5/8))
DELTA = -89/36
DELTA < 0
x in { }
x belongs to the empty set
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