TeX Quellcode:

\begin{array}{crclcl}\text{1. Zeile:} & \ln(e^x) &=& \ln(2)+\ln(7)-\ln\left(\dfrac{1}{2}\right)+2\ln\left(2^{-1}\right) \cr\cr \text{2. Zeile:} & x &=& \ln(2)+\ln(7)-\ln\left(\dfrac{1}{2}\right)+2\ln\left(2^{-1}\right) \cr\cr \text{3. Zeile:} & x &=& \ln\left(\frac{2\cdot 7}{\frac{1}{2}}\right)+\ln\left(2^{-2}\right) \cr\cr\text{4. Zeile:} & x &=& \ln\left(2\cdot 7\cdot 2\cdot 2^{-2}\right) \cr\cr & x &=& \ln(7) \in\mathbb{D} \cr\cr\cr& \mathbb{L} &=& \left\{\ln(7)\right\}\end{array}