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I wish to have the following. There are several solutions on the platform, dealing with either left aligned text or rightly placed curly brace to the numbered set of equations. But, I am not able to produce both simultaneously.

enter image description here

Gaurang
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    Especially the third answer (https://tex.stackexchange.com/a/47564/) seems to do what you want. – Marijn Oct 15 '20 at 14:38
  • @Marijn If I understand correctly the question is also about getting the text and left-aligned. I think. – campa Oct 15 '20 at 14:39
  • @campa I see, that is indeed different - however, it seems a bit unusual to put and there, a system of equations always implies conjunction I think? Unless you want to contrast it with or elsewhere or something. – Marijn Oct 15 '20 at 14:43
  • @Marijn I completely agree with you that the request is somewhat odd. Anyway I'd wait from a feedback from the OP. – campa Oct 15 '20 at 14:44
  • The format I seek is used by the journal Proceedings of Royal Society 'A'. At several other places, they put the left-aligned conjunction 'and' in the next line of the first equation of the system of two which I can obtain using \intertext{} in align mode. – Gaurang Oct 15 '20 at 14:58

1 Answers1

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I propose one of these layouts, not exactly what you're asking, but with a simple code:

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

Blah. Blah. Blah. Blah. Blah. Blah. Blah. Blah. Blah. Blah. Blah. Blah. Blah. Blah. Blah. Blah. Blah. Blah. Blah. Blah. Blah. Blah. Blah. Blah.
\begin{flalign}
 & \text{and} & \begin{rcases}a = d\cos x \b = d\sin x\end{rcases} & &
\end{flalign}
\vskip 1cm


\begin{equation}
\begin{rcases}
  a = d\cos x \
  \llap{and\qquad} b = d\sin x
 \end{rcases}
\end{equation}


\begin{flalign}
 & \begin{aligned}\ \text{and}\end{aligned} & \begin{rcases}a = d\cos x \ b = d\sin x\end{rcases} & &
\end{flalign}


\end{document}

enter image description here

Bernard
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