Better support for mixed numbers

[ldworkin]

Right now mathjax cannot parse a mixed number like 1 3/4; instead it expects the input to look like e.g. 1(3)/(4), which is parsed as division with implicit multiplication in the numerator. This is confusing and unintuitive. We can definitely fix when we have a custom parser, but can we do anything smarter in the meantime?

[evykassirer]

one thought is to change it to (1 + 3/4) before you send to mathsteps - or do you think that makes it not a mixed fraction anymore and is confusing?

[ldworkin]

Yea, I don't like this solution -- that messes up the pedagogy that Gen wanted for this.

[evykassirer]

ah okay, I see!