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Thank you very much. This is great!

For one, "Heat and Thermodynamics", 7th Ed. ISBN 0-07-114816-7.

Johannes_B, it would be something like:

and f(x)=sin(x)+cos(x) (1.1)

or, it could be more verbose, like:

it follows that f(x)=sin(x)+cos(x) (1.1)

where the word "and" or the words "it follows that" would be left justified, and the equation numbers would be right justified. This would not be used ...

Thank you Stefan_K for the idea. That is not quite it.

I need text be be left justified on the same line, with the equation material in the center, and the equation number right justified.

See my example for equationTest.

\documentclass[fleqn]{article}
\usepackage{amsmath}
\setlength{\mathindent ...

I wish to write a \begin{equation}\end{equation} line where the equation number shows on the right margin, AND have text flushleft on the same line.

I have tried:
{Sample text}\parbox{length}{\begin{equation} eq text \end{equation}}

This is a hit and miss method, where the length of parbox has ...