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I produce something like below but have not able all I have is the nodes but it doesn't work, any help would be appreciated

 \documentclass{article}

 \usepackage{tikz}
 \usetikzlibrary{arrows.meta}

 \begin{document}

 \begin{tikzpicture}[
   vertex/.style = {shape=circle,draw,minimum size=2em},
   edge/.style = {->,-Latex},
   ]
   % Vertices
   \node[vertex] (c) at (0,0) {6};
   \node[vertex] (a) at (-2,-2) {};
   \node[vertex] (b) at (2,-2) {};
   \node[vertex] (d) at (0,-3) {6};
   \node[vertex] (e) at (-1,-5) {?};
   \node[vertex] (f) at (1,-5 {?};
   \node[vertex] (g) at (-2,-7) {};
   \node[vertex] (h) at (0,-7) {5};
   \node[vertex] (i) at (2,-7) {};
   \node[vertex] (bx) at (0,-9) {5};
   % Edges
   \draw[edge, ultra thick] (a) -- (c) node[midway,left] {$\times$}  ;
   \draw[edge, ultra thick] (b) -- (c) node[midway,right] {$\times$} ;
   \draw[edge, ultra thick] (g) -- (bx) node[midway,left] {$\times$}  ;
   \draw[edge, ultra thick] (I) -- (bx) node[midway,right] {$\times$} ;
   \draw[edge, ultra thick] (a)t to  node[left] {} (i);

  \end{document}

What I would like

If you know hw to just write the equation to make this work that would be amazing but equally as good if I could just hand type the numbers.

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