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