TeX Quellcode:

\begin{array}{rclcll}\dfrac{-x^2+4x-6}{(x-2)(x-4)} & \leq & 0 & \vert & \cdot (x-2)(x-4) \\-x^2 + 4x - 6 & \geq & 0 & \vert & \cdot (-1) \\x^2 - 4x + 6 & \leq & 0 \\\end{array}