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D( h )
h = 0
h = 0
h = 0
h in (-oo:0) U (0:+oo)
(5/6)*h-(7/12) = -3/h-(13/6) // + -3/h-(13/6)
(5/6)*h-(-3/h)-(7/12)+13/6 = 0
(5/6)*h+3*h^-1-7/12+13/6 = 0
5/6*h^1+3*h^-1+19/12*h^0 = 0
(5/6*h^2+19/12*h^1+3*h^0)/(h^1) = 0 // * h^2
h^1*(5/6*h^2+19/12*h^1+3*h^0) = 0
h^1
(5/6)*h^2+(19/12)*h+3 = 0
(5/6)*h^2+(19/12)*h+3 = 0
DELTA = (19/12)^2-(3*4*(5/6))
DELTA = -1079/144
DELTA < 0
h in { }
h belongs to the empty set
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