I want to use the flalign so I can have left aligned text in-between equations. For example

    && f &= ma&\\
    \text{Which we may express as} \\
    && f &= m \frac{dv}{dt}

However this gives an equation number for every line, including the \text{...}.

How can I have one equation number that appears centered for the rendered result, as with any other equation number.

  • 1
    One possible solution is \nonumber on the lines one doesn't wish to see an equation number.
    – Q.P.
    Aug 24 '20 at 17:52
  • 1
    This question might help.
    – doobdood
    Aug 24 '20 at 18:17
  • Will your readers understand what the number at the level of the textual insertion refers to?
    – egreg
    Aug 24 '20 at 21:19
  • I sure hope so!
    – Q.P.
    Aug 24 '20 at 21:33

    && f &= ma&             \notag  \\
\text{Which we may express as}      \\
    && f &= m \frac{dv}{dt} \notag

You may consider the following solution:
f &= ma                             \\
\intertext{Which we may express as}
f &= m \frac{dv}{dt}         

enter image description here

  • Nice solution, is there a way to keep the equation centred on the page, while keeping the in-equation text left justified?
    – Q.P.
    Aug 24 '20 at 20:05
  • 1
    @Q.P., the second example provide this, Yes, it hasn't common equation number on the vertical middle, however it is replaced by two (to my opinion) more meaningful equation sub numbering.
    – Zarko
    Aug 24 '20 at 20:26

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