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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
1/x = x/6-(5/6) // - x/6-(5/6)
1/x-(x/6)+5/6 = 0
1*x^-1-1/6*x^1+5/6*x^0 = 0
(5/6*x^1-1/6*x^2+1*x^0)/(x^1) = 0 // * x^2
x^1*(5/6*x^1-1/6*x^2+1*x^0) = 0
x^1
(-1/6)*x^2+(5/6)*x+1 = 0
(-1/6)*x^2+(5/6)*x+1 = 0
DELTA = (5/6)^2-(1*4*(-1/6))
DELTA = 49/36
DELTA > 0
x = ((49/36)^(1/2)-(5/6))/(2*(-1/6)) or x = (-(5/6)-(49/36)^(1/2))/(2*(-1/6))
x = -1 or x = 6
x in { -1, 6}
x in { -1, 6 }
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