Aloha :)
$$\left(\begin{array}{r}x & y & z & =\\ \hline -1 & 3 & 2 & 4\\ -0,5 & 1 & 4 & 6\\ 0,5 & -2 & 3 & 4\end{array}\right)\begin{array}{l}{}\\{\cdot(-1)}\\{+\text{Zeile } 3}\\{+0,5\cdot\text{Zeile }1}\end{array}$$$$\left(\begin{array}{r}x & y & z & =\\ \hline 1 & -3 & -2 & -4\\ 0 & -1 & 7 & 10\\ 0 & -0,5 & 4 & 6\end{array}\right)\begin{array}{l}{}\\{-3\cdot\text{Zeile }2}\\{\cdot(-1)}\\{-0,5\cdot\text{Zeile }2}\end{array}$$$$\left(\begin{array}{r}x & y & z & =\\ \hline 1 & 0 & -23 & -34\\ 0 & 1 & -7 & -10\\ 0 & 0 & 0,5 & 1\end{array}\right)\begin{array}{l}{}\\{+46\cdot\text{Zeile }3}\\{+14\cdot\text{Zeile }3}\\{\cdot2}\end{array}$$$$\left(\begin{array}{r}x & y & z & =\\ \hline 1 & 0 & 0 & 12\\ 0 & 1 & 0 & 4\\ 0 & 0 & 1 & 2\end{array}\right)$$