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What is the numerical value of $x$:
$x = \dfrac{1}{3-\dfrac{1}{3-\dfrac{1}{3-\ldots}}}$

$\begin{array}{|rcll|} \hline x &=& \dfrac{1}{3-\dfrac{1}{3-\dfrac{1}{3-\ldots}}} \\\\ x &=& \dfrac{1}{3-x} \\\\ x(3-x) &=& 1 \\\\ 3x-x^2 &=& 1 \\\\ \mathbf{x^2-3x+1} &=& \mathbf{0} \\\\ x &=& \dfrac{3\pm \sqrt{9-4*1} }{2} \\\\ x &=& \dfrac{3\pm \sqrt{5} }{2} \\\\ \mathbf{x} &=& \mathbf{\dfrac{3-\sqrt{5} } {2} } \\ \hline \end{array}$