\begin{subequations}
\begin{align}
    (1 + \partial_t)x^A(t) &= \eta^A(t) + k C(0) x^A(t), \label{eq:slow-replica-single-site-picture-A} \\
    x^B &= \eta^B + k Q(0) x^A(0).
    \label{eq:slow-replica-single-site-picture-B}
\end{align}
\end{subequations}
