다음과 같은 수식 왼쪽 정렬 방법좀 알려주세요.

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\begin{frame}

\frametitle{AAAA}

\begin{itemize} \small

\item Objective: BBB \\

\item specification: CCC

{\setlength\arraycolsep{2pt}

\begin{eqnarray}

lnQ_{ijkt} = \alpha_{j} + \delta_{kt} + \sum_{t=-4}^{25} \alpha_{t-l}^{good} R_{it-l}^{good} + \sum_{t=-4}^{25} \alpha_{t-l} R_{it-l} \nonumber\\

{} + \sum_{t=-4}^{25} \alpha_{t-l}^{bad} R_{it-l}^{bad} + \sum_{t=-4}^{25} \gamma_{t-l}ADVERT_{it-l} + \eta_{ijkt} \nonumber

\end{eqnarray}}

\item where is the contribution level

\end{itemize}

\end{frame}