\input{preamble-standalone.ltx}
\begin{document}

% Ex. No. 6 (Section  4.2 : The role of \tkzname{\tkznameofpack})

\begin{tikzpicture}[x=0.000001 cm]
 \coordinate (x) at (6000000,0);
  \draw (0,0)--(x);
\end{tikzpicture}

\end{document}