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f(x)=\frac{1}{x}
y &=& \log_e x \\
\frac{d}{dx}y &=& \frac{1}{x}
\pyranose{1Sa==H;2Sb==H;2Sa==OH;3Sb==H;3Sa==OH;4Sb==HO;%
4Sa==H;5Sb==H;5Sa==CH$_{3}$;%
1Sb==\ryl(8==O){3==%
\steroid{3==(yl);5A==H;8B==H;9A==H;{{10}B}==\lmoiety{OHC};{{14}A}==OH;%
{{13}B}==\lmoiety{H$_{3}$C};{{16}B}==OH;%
{{17}B}==\fiveheterov[e]{3==O}{4D==O;1==(yl)}}}}
\left\{ \begin{array}{rcrcr}
2x & + & 5y & = & -3 \\
3x & + & y & = & 2
\end{array} \right.
\mbox{\LaTeX}