TeX Quellcode:
\begin{array}{rclcl} \mathbb{D} &=& \mathbb{N^+} \cr \cr 8+5x & \geq & 50 & \vert & -8 \cr\cr 5x & \geq & 42 & \vert & :5 \cr\cr x & \geq & \dfrac{42}{5} = 8{,}4 \cr \cr \mathbb{L} &=& \{9; 10; 11; \dots\} \end{array}