I am trying to put 3 equations with "=" signs aligned but also left aligned. I tried the following:

\documentclass{article} \usepackage{amsmath} \begin{document}

\begin{flalign*} RPC &= A+B\tilde{f} +C x &\ A &= a+\eta &\ E &= cte & \end{flalign*}

\end{document}

With this I get the stuff in the left and the "=" signs aligned. However, I also need A (in the second equation) and E (in the third equation) to be aligned to the R (in the first one)

Does anyone know how to get it?

thanks