Is there a way to force the directionality of a line of text in the GUI?

[Evan Aad]

When composing a bilingual document that combines a right-to-left
language, such as Hebrew, with a left-to-right language, such as
English, is there a way to force the left- or right alignment of a
line of text in the Emacs GUI when the text in that line contains no
letters of either alphabet.

For example, when writing a mathematical text in Hebrew, intended to
be typeset by the TeX system, the following display-mode equation may
occur:
$$
x+y=z
$$

In this case the Emacs GUI would align the initial $$ along the
buffer's right margin, whereas the next two lines would be aligned
along the left margin. This causes a disruption of the logical
cohesiveness of the LaTeX code. Is there a way that I could indicate
to the Emacs GUI to align the initial $$ along the left margin?