LaTeX.org

It works perfectly, thanks a lot Th

Hello

I would like to justify left only one subequation in an environment leaving the rest centered. Is there a way to do this?
Specifically my code is

\begin{subequations}\label{eq:asymcoef}\begin{align}
\alpha_{j}=\left(\sum _{k=1}^{6}a_{kj}\right) \\
\text{and}\nonumber \\
\beta_{j}=\left ...