diff --git a/4-4.pdf b/4-4.pdf
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diff --git a/4-4.tex b/4-4.tex
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--- a/4-4.tex
+++ b/4-4.tex
@@ -257,5 +257,41 @@ x_1+x_2+2q+2&=2&&|x_2=p\\
 &&x_1&=-2q-p&\Rightarrow&\mathbb{L}=\{(-2q-p,p,q,2q+2)\}
 \end{align}
 
+\item %f
+\begin{tabular}{c}
+2II zu I add\\
+2IV zu II add
+\end{tabular}
+$\left(\begin{matrix}
+0&1&7&-3&1\\
+0&3&-1&-8&4\\
+0&2&3&1&9\\
+1&1&-1&-3&2
+\end{matrix}\right)$
+\begin{tabular}{c}
+-3I zu II add\\
+-2I zu III add
+\end{tabular}
+$\left(\begin{matrix}
+0&1&7&-3&1\\
+0&0&-22&1&1\\
+0&0&-11&7&7\\
+1&1&-1&-3&2
+\end{matrix}\right)$
+
+\begin{tabular}{c}
+(-2)III zu II\\
+I $\leftrightarrow$ IV\\
+II $\leftrightarrow$ IV
+\end{tabular}
+$\left(\begin{matrix}
+1&1&-1&-3&2\\
+0&1&7&-3&1\\
+0&0&-11&7&7\\
+0&0&0&-13&-13\\
+\end{matrix}\right)$
+$\Rightarrow\mathbb{L}=\{(1,4,0,1)\}$
+
+
 \end{enumerate}
 \end{document}
\ No newline at end of file