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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
6/x = x/19 // - x/19
6/x-(x/19) = 0
6*x^-1-1/19*x^1 = 0
(6*x^0-1/19*x^2)/(x^1) = 0 // * x^2
x^1*(6*x^0-1/19*x^2) = 0
x^1
(-1/19)*x^2+6 = 0
(-1/19)*x^2+6 = 0
DELTA = 0^2-(4*6*(-1/19))
DELTA = 24/19
DELTA > 0
x = ((24/19)^(1/2)+0)/(2*(-1/19)) or x = (0-(24/19)^(1/2))/(2*(-1/19))
x = -19/2*(24/19)^(1/2) or x = 19/2*(24/19)^(1/2)
x in { -19/2*(24/19)^(1/2), 19/2*(24/19)^(1/2)}
x in { -19/2*(24/19)^(1/2), 19/2*(24/19)^(1/2) }
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