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\documentclass[a4paper,12pt]{report}
\makeatletter
\newcommand{\textarrow}[2][1]
{ \settowidth{\@tempdima}{#2}
\stackrel{#2}
{\makebox[#1\@tempdima][l]{\rightarrowfill}}
}
\makeatother
\begin{document}
\begin{eqnarray*}
y = f(x) & \textarrow[1.5]{Transformation} & Y = F(X)\\
y = f(x) & \textarrow{\ensuremath{x\mapsto X}} & Y = F(X)
\end{eqnarray*}
\end{document}
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