I wish to left align a part of my equation (the description of the variable used in the equation) after my intertext while keeping the main equation center aligned, as shown in Figure below...
Although I managed to do it using {equation} followed by {flalign*} this introduced 'linebreak' after the main equation which is centred (see 1st box).
I also tried using {flalign} with \noalign but this remove the equation numbering as well as producing a big gap between the equation (see 2nd box) and text which i wish to avoid...
Is there any ways to solve this issue?
My code is as follow:
\documentclass[a4paper,11pt,oneside]{memoir}
\usepackage{mathtools}
\usepackage{lipsum}
\begin{document}
Case 1:\\
\lipsum[75]
\begin{equation}
x' = \overline{x} \pm u_{\overline{x}} \qquad(P\%)
\end{equation}
\begin{flalign*}
\shortintertext{where}
\qquad \overline{x} &= \text{Most probable estimate of } x' \text{ based on the available data} &\\
\qquad \pm u_{\overline{x}} &= \text{Uncertainty interval in that estimate at some probability level, } P\% &\\
\qquad P &= \text{Probability level or confidence level} &
\end{flalign*}
Case 2:\\
\lipsum[66]
\begin{flalign}
\noalign{\centering $x' = \overline{x} \pm u_{\overline{x}} \qquad(P\%)$}
\shortintertext{where}
\qquad \nonumber \overline{x} &= \text{Most probable estimate of } x' \text{ based on the available data} &\\
\qquad \nonumber \pm u_{\overline{x}} &= \text{Uncertainty interval at some probability level, } P\% &\\
\qquad P &= \text{Probability level or confidence level} &
\end{flalign}
\end{document}