\begin{tikzpicture}[>=latex]

\draw[cyan, densely dotted] (-5,-5) grid (5,5);
	\useasboundingbox (-5,5) rectangle (5,5);
	\matrix (m1) [row sep=6mm,column sep=5mm,matrix of nodes,column 6/.style={anchor=base west}, left delimiter=\{ ]
	{\phantom{a} & $3$  & $0$ & $1$ & $-5 $ & $2$ & \phantom{a}\\
		\phantom{a}  & \phantom{a} & $6$ & $12$ & $26$ & $42$ & \phantom{a}\\
		$2$ & $3$ & $6$ & $13$ & $21$ & $44=g(2)$\\
};


	\matrix (m2) [below=of m1.south west, anchor= north west,yshift=6mm, row sep=6mm,column sep=5mm,matrix of nodes,column 5/.style={anchor=base west} , left delimiter=\{]
	{

	\phantom{a} & \phantom{a} & $6$ & $24$ & $74$ & \phantom{a}\\
	$2$ & $3$ &	$12$ & $37$ & $95=g'(2)$ \phantom{a}\\
};

	\matrix (m3) [below=of m2.south west, anchor= north west,yshift=6mm, row sep=6mm,column sep=5mm,matrix of nodes,column 4/.style={anchor=base west} , left delimiter=\{]
	{
\phantom{a} & \phantom{a} & $6$ & $36$ &  \phantom{a}\\
	$2$ & $3$ &	$18$ &  $73=g''(2)$ \phantom{a}\\
};


	\draw ([xshift=.1cm]m1-1-1.north east) -- ([xshift=.1cm]m2-2-1.south east);

	\draw ([yshift=-.25cm]m1-2-1.south west) -- ([yshift=-.25cm,xshift=1cm]m1-2-6.south east);
	
	\draw ([yshift=2mm]m1-3-6.north west) -- ([yshift=-1mm]m1-3-6.south west);
	
	%\draw ([yshift=-.25cm]m1-2-6.south west) -- ([yshift=-.25cm,xshift=4mm]m1-2-6.south east);
	
	\draw ([yshift=-.15cm]m1-3-6.south west) -- 
	([yshift=-.15cm]m1-3-6.south east);
	

	\node[circle] (del-left-1) at ($0.5*(m1-3-1.south west)+0.5*(m1-1-1.north west)$){};
%	\node[draw,rectangle,left delimiter=\{] (del-left-1) at (m1-2-1) {\tikz{\path (m1-1-1.north east) rectangle (m1-3-1.south west);}};
	\node[left=10pt] at (del-left-1.west) {1. Schritt};

%\draw ($(m2-1-1.north east)!0.5!(m2-1-2.north west)$) -- ($(m2-2-1.south east)!0.5!(m2-2-2.south west)$);

	\node[circle] (del-left-2) at ($0.5*(m2-2-1.south west)+0.5*(m2-1-1.north west)$){};

\node[left=10pt] at (del-left-2.west) {2. Schritt};

%	\node[rectangle,draw] (del-left-2) at ($(m2-2-1)-(m2-1-1)$) {\tikz{\path (m2-2-2.north east) rectangle (m2-2-1.south west);}};
%	\node[left=10pt] at (del-left-2.west) {2. Schritt};
 %\mymatrixbracetop{2}{6}{$E'$}

%\node[font=\color{red}] at (m2.center){X};

%\foreach \xy in {$1*(m2-1-1)$, $1*(m2-2-1)$}{
%    \node at (\xy) {\xy};
%}

\end{tikzpicture}