TeX Quellcode:

\begin{array}{rclcl}\ln\left(\dfrac{1}{5}e^7 \cdot 2x^2\right) &=& 2\ln\left(6x\right) &\vert & \text{3. Logarithmengesetz} \\\ln\left(\dfrac{2}{5}e^7x^2\right) &=& \ln\left(36x^2\right) &\vert & e^* \\\dfrac{2}{5}e^7x^2 &=& 36x^2 &\vert & :x^2 \\\dfrac{2}{5}e^7 &=& 36 \\\end{array}