TeX Quellcode:

\begin{array}{rclcl} \dfrac{1}{x} &\geq& 5 &\vert& \cdot x \cr 1 &\leq& 5x &\vert& : 5 \cr \dfrac{1}{5} &\leq& x \cr x &\geq& \dfrac{1}{5} \end{array}