Unrelated to the general question of usefulness, but I'd be careful using it as a mathematics tutor.
Maybe the algebra in this case is sufficiently basic as to be trivial for chatgpt, but I've found that quite often it gets confused by relatively simple mathematics in very baffling ways (One particular example I found amusing is it trying to use the pigeonhole principle with exactly N pigeons and N pigeonholes).
There's also the problem that, being a complete pushover, it's hard (specially for a learner) to pinpoint whether the error is in the source or in the understanding of the reader. A teacher may, upon the request of a student to clarify what it seems like a mistake, say "No, this may seem wrong but it's correct for so and so reasons", but chatgpt usually goes "You're right, that was a mistake" and gets itself into messier and messier reasoning.