Rocketboy didn't delete the post (or even blank it) themselves. The poster closed their account but the post stayed up. But then someone else reported it and removed it. I don't think the latter should have happened.
Ah, OK. I do wish there was more transparency around this stuff, and my apologies to @rocketboy (or their next incarnation :P ) for my mistaken assumption.
Asking for homework help is allowed and happens frequently. Asking people to do the homework for you is frowned upon. There's also a gray area between the two. Different people are willing to help to different degrees.