Caption below a figure when there is an equation next to that figure

Question

I'm wondering how can I write the caption of a figure (which is next to an equation) only below the figure. The following code allows to write the caption on the right side of the figure:

\documentclass{article}

\usepackage[demo]{graphicx}
\usepackage{sidecap}

\begin{document}

\begin{SCfigure}
  \begin{minipage}{.5\textwidth}
    \begin{equation}
        f(x)=x^2
    \end{equation}
  \end{minipage}%
  \begin{minipage}{.5\textwidth}
    \centering
    \includegraphics[scale=0.6]{myimage}
    \caption{\caption{Esempio di efficienza inversa nel caso di trasmissione meccanica con quattro stadi.}}
  \end{minipage}
\end{SCfigure}

\end{document}

Answer 1

The only tricky part is aligning the equation to the image, as opposed to the image plus caption.

\documentclass{article}

\usepackage[demo]{graphicx}

\begin{document}

\begin{figure}
  \begin{minipage}{.5\textwidth}
    \begin{equation}
        f(x)=x^2
    \end{equation}
  \end{minipage}\hfill
  \begin{minipage}[t]{.5\textwidth}% use first baseline
    \centering
    \raisebox{-0.5\height}{\includegraphics[scale=0.6]{myimage}}
    \caption{Esempio di efficienza inversa nel caso di trasmissione meccanica con quattro stadi.}
  \end{minipage}%
  %\llap{\rule{\textwidth}{0.5pt}}% show baseline
\end{figure}

\end{document}