$\Newextarrow{\xhookrightarrow}{10,10}{0x21AA}$
9.4
\begin{equation} \begin{gathered}\label{equation:localizing-morphisms-closed-under-pushout} \xymatrix@C =50pt@R=50pt{ X \ar [r]^-{w} \ar [d] & Y \ar [d] \\ X' \ar [r]^-{w'} & Y' } \end{gathered} \end{equation}