I'm trying to make an array of equations where some of them are marked with right braces. For the right braces I have used the rcases
command from the solution offered at: https://tex.stackexchange.com/a/47563/131192. I want the equations to be aligned at the equal sign, but I can't manage to do so. Here is an example of what I'm trying to do, but it doesn't give me good results:
\documentclass{article}
\usepackage{amsmath}
\newenvironment{rcases}
{\left.\begin{aligned}}
{\end{aligned}\right\rbrace}
\begin{document}
\begin{align*}
&\begin{rcases}
a &= b + c \\
d &= e + f + g \\
h &= i + j + k + l
\end{rcases}
\text{ three equations}\\
&\begin{rcases}
\implies m &= n \\
o &= p*q
\end{rcases}
\text{another two equations}
\end{align*}
\end{document}
Thanks for any help!