\documentclass[tikz,border=5pt]{standalone}
\usepackage[table, x11names]{xcolor}
\usepackage{amsmath,amssymb,amsfonts}
\usepackage{tikz}
\usetikzlibrary{positioning,chains}
\begin{document}
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\draw (320.26,201.59) node {$r_{t+1}$};
\draw (200.86,140.07) node {$\widehat{V}(s_{t-1})$};
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\draw (380.26,200.16) node {$r_{T}$};
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\end{document}