[O] Latex strikethrough or cancel?

[Lawrence Bottorff]

I've got a fraction done this way in an org file:

\[

 \frac{1}{(2^3)(5)}

 \]

and I'd like to strike though or cancel the (5) part. The Latex method I've found says do it this way:

...

\usepackage[makeroom]{cancel}

...

\[

 \frac{1}{(2^3)\cancel{(5)}}

 \]

But it's ignored and comes back verbatim. Of course +(5)+ doesn't work either, again, coming back verbatim with the pluses. How can I do this?

LB