$\Newextarrow{\xhookrightarrow}{10,10}{0x21AA}$
9.15
\begin{equation} \begin{gathered}\label{equation:pushout-of-weakly-left-orthogonal} \xymatrix@R =50pt@C=50pt{ A \ar [r] \ar [d]^{f} & A' \ar [d]^{f'} \\ B \ar [r] & B'. } \end{gathered} \end{equation}