Q:

\llap (or \rlap) at the beginning of an indented paragraph

If I use a \llap{text} command at the beginning of an indented paragraph, the text is not indented and is put on the line above the paragraph.
\documentclass{article}
\begin{document}

\parindent=2cm

\llap{x}Hello

H\llap{x}ello

\end{document}

Using the code above, I get the x above and far too the left, relative to the H in the first case, but I get the correct result in the second case (the x is just to the left of the e).

How can I get the x just to the left of the H?
I tried putting a vphantom{X} just before the \llap to force the paragraph to start, but that didn't change the result at all.

A:

\llap is not a LaTeX box command and does not start a paragraph.
\documentclass{article}
\begin{document}

\parindent=2cm

\makebox[0pt][r]{x}Hello

H\makebox[0pt][r]{x}ello

\end{document}

A:

You can also use 
\indent\llap{x}Hello

