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Another solution is to put an hfill right after the beginning of the theorem like environment:

\documentclass[12pt,a4paper,oneside]{report}
\pagestyle{myheadings}
\usepackage{amsmath,amssymb,amscd,amsthm,amstext}

\newtheorem{thm}{Theorem}
\def \imp {\Rightarrow}

\begin{document}
\title{Real ...