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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(4/5)*x+(1/6)*x = 1/x // - 1/x
(4/5)*x+(1/6)*x-(1/x) = 0
(4/5)*x+(1/6)*x-x^-1 = 0
29/30*x^1-1*x^-1 = 0
(29/30*x^2-1*x^0)/(x^1) = 0 // * x^2
x^1*(29/30*x^2-1*x^0) = 0
x^1
(29/30)*x^2-1 = 0
(29/30)*x^2-1 = 0
DELTA = 0^2-(-1*4*(29/30))
DELTA = 58/15
DELTA > 0
x = ((58/15)^(1/2)+0)/(2*(29/30)) or x = (0-(58/15)^(1/2))/(2*(29/30))
x = 15/29*(58/15)^(1/2) or x = 15/29*(58/15)^(1/2)
x in { 15/29*(58/15)^(1/2), 15/29*(58/15)^(1/2)}
x in { 15/29*(58/15)^(1/2), 15/29*(58/15)^(1/2) }
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