# How to have multiple rows on the left side of an equation

I have an equation whose left side has a long text. I would like to make it on multiple rows followed by the equal sign and then the right side.

\documentclass[12pt]{article}
\usepackage{amsmath}
\begin{document}

$$\text{The left hand side of this equation is very long} = a < x < b$$

\end{document}


This is what I want. The left side has two rows so that it's not too wide.

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\parbox{4cm}{\raggedright The left hand side of this equation is very long}


replacing 4cm by whatever length you need.

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Is there an automatic way of specifying the width? Now I have to try a few times to get the correct width. Thanks. –  Patrick Li Jun 28 at 19:47
@PatrickLi not really, tex either sets text all in a line (line \mbox or line breaks it to a fixed with (like parbox) it is up to you to decide how much space to allocate to the text. –  David Carlisle Jun 28 at 21:17