TeX Quellcode:

\begin{array}{rclcl}14(-x+2) & \leq & (4+2x) \cdot 7 \\-14x+28 & \leq & 28+14x & \vert & -28-14x \\ -28x & \leq & 0 & \vert & :\left(-28\right) \\ x & \geq & 0\end{array}