Hey Tek-Ninjas! Back in September of 2014 I wrote about a number of tech supports for math.
I was particularly impressed with Mod Math, though wished it had some higher level functions. At the time, I spoke with Dawn from Mod Math, and learned that the company was in the process of developing algebraic functions for the app.
Well. That's been done. Mod Math continues to be a free app. And now, it is better than ever. Be sure to take a look at it, likely it can help some of your students struggling with the writing process of mathematics.