where parens imply order of evaluation, which isn't always the case

This has been bugging me. Which language would that be? Given

$small+($huge1-$huge2)
[download]

I know that Perl and C doesn't define whether $small or $huge1-$huge2 is evaluated first, but nowhere I've seen has mentioned that they can apply mathematical equivalence rules that don't work with floats to refactor equations. The LHS of the "+" in the code will be used as the LHS of the "+" operator, and similarly for RHS.