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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
1/2-(1/x) = (1/3)*x // - (1/3)*x
1/2-((1/3)*x)-(1/x) = 0
(-1/3)*x-x^-1+1/2 = 0
1/2*x^0-1/3*x^1-1*x^-1 = 0
(1/2*x^1-1/3*x^2-1*x^0)/(x^1) = 0 // * x^2
x^1*(1/2*x^1-1/3*x^2-1*x^0) = 0
x^1
(-1/3)*x^2+(1/2)*x-1 = 0
(-1/3)*x^2+(1/2)*x-1 = 0
DELTA = (1/2)^2-(-1*4*(-1/3))
DELTA = -13/12
DELTA < 0
x in { }
x belongs to the empty set
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