[MD and LaTeX to PDF] `\newline` is not creating new lines when intermediate format is LaTeX

[Smallcreek <gotgoogzagain322-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>]

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Dear pandoc-discuss,

In my document, I have math that spans multiple lines. In my Markdown 
file's display LaTeX, I use `\newline` to separate my math across multiple 
lines. The problem is that the output will differ depending on my 
`--pdf-engine.` If I use Weasyprint with `--webtex` for example, `\newline` 
renders a line break properly. If I use LuaLaTeX (which is the engine I 
need), XeLaTeX, or PDFLaTeX, `\newline` has no effect. Here's a list of 
commands and markup I've tried alongside their output:

$ pandoc --pdf-engine=lualatex -V geometry:margin=1in -V fontsize=12pt 
source.md -o out.pdf
```
V_{1} = R_{\text{V}, 1} I \newline\newline
I = \frac{V_{1}}{R_{\text{V}, 1}} \newline\newline
  = \frac{9.0}{300} \newline\newline
  = 0.03 \text A
```
Output:
[image: attachment_1.png]

$ pandoc --pdf-engine=weasyprint --webtex source.md -o out.pdf # same latex
Output:
[image: attachment_2.png]

I looked it up, and one result[1] says I have to use `\begin{align*} ... 
\end{align*}`. I also tried {aligned}, {align}, {multiline} and {split} --- 
but the result is the same using each of these (except for multiline and 
align*, which produce errors. Multiline is undefined and align* is a nested 
environment, apparently). I really hope I didn't miss anything while 
looking this problem up. Am I even supposed to use \newline in the first 
place?

[1]: https://stackoverflow.com/questions/63350182/pandoc-not-generating-new-lines-in-markdown-with-latex#63354732

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