align right braces

Question

I found this latex sample, close to what I need but fail to modify it like I need. I try to understand how to do, reading about eqparbox package but it doesn't help me more.

I want to make braces on several lines of left text (text 1,2,3,...) with explanations on the right side of the braces (explanation A, B). I would like to:

• align braces
• remove (1a, 1b, ...)

it only be text, no math or calculus.

here is the code:

\documentclass{article}
\usepackage{mathtools}
\usepackage{eqparbox}
\newcommand\EqMathBox[2][x]{%
 \eqparbox{#1}{$\displaystyle #2$}%
}
\begin{document}
\begin{subequations}
\begin{align}
    %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
    & \begin{rcases}
        \text{text 1}         \
        \text{text 2}     \
        \text{text 3} \
    \end{rcases}%
    \quad\text{explenation A}       && \
    %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
    & \begin{rcases}
        \text{a longer text}             \
        \text{a quit more longer text}      \
    \end{rcases}
    \quad\text{explenation B} &&
    %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
    \end{align}
    \end{subequations}
\end{document}

here is the origin of the sample

Answer 1

See, if you are after the following :

\documentclass{article}
\usepackage{mathtools}
\usepackage{eqparbox}
\newcommand{\eqmathbox}[2][l]{\eqmakebox[#1][l]{$\displaystyle#2$}}
\begin{document}
\begin{align}
    &\begin{rcases}
    \eqmathbox{\text{text 1}}     \
    \eqmathbox{\text{text 2}}     \
    \eqmathbox{\text{text 3}}

     \end{rcases}
        && \text{three equations}\[1ex]
    &\begin{rcases}
    \eqmathbox{\text{a longer text}}     \
    \eqmathbox{\text{a quit more longer text}}

     \end{rcases}
        && \text{two equations}
 \end{align}
\end{document}

Answer 2

Something iike this? (Note the absence of \eqmathbox wrappers.)

\documentclass{article}
\usepackage{mathtools}
\begin{document}
\begin{align}
\begin{rcases}
        \text{text 1} \
        \text{text 2} \
        \text{text 3} 
\end{rcases}\ 
&\text{explanation A} \
\begin{rcases}
        \text{a longer text}  \
        \text{a quite a bit longer text} 
\end{rcases}\ 
&\text{explanation B} 
\end{align}
\end{document}

Answer 3

In the solution below, the main environment array is used to add the right braces. Then inner tabular is to gather rows of text with eqpabox to make sure all right braces are right-aligned.

In order to apply \eqparbox to each row (cell) of tabular env., I load collcell along with array package and defined a custom column which adds a small macro: \pbox which in turn applies \eqparbox.

\documentclass{article}
\usepackage{array}
\usepackage{collcell}
\usepackage{eqparbox}
\newcommand\pbox[1]{\eqparbox{alist}{#1}}
\newcolumntype{P}{>{\collectcell\pbox}l<{\endcollectcell}}
\begin{document}
\bgroup
  \setlength\tabcolsep{0pt}
  \setlength\arraycolsep{0pt}
  \renewcommand\arraystretch{1.25}
  [
    \begin{array}{l @{\quad} l}
      \left.\begin{tabular}{P}
        text 1\
        text 2\
        text 3\
        text 4
      \end{tabular}\right}
      & \textrm{explanation A} \
      \left.\begin{tabular}{P}
        a longer text\
        a quit more longer text\
        ... even much much longer text
      \end{tabular}\right}
      & \textrm{explanation B}
    \end{array}
  ]
\egroup
\end{document}