Balancing of Chemical Equations Using Matrix Algebra (2015) (iiste.org)

sorry, I'm missing the joke. this was homework in my linear algebra class last semester. why was it published in a science journal in 2015?

I'm very confused. This was an example of applications of linear algebra in my first year course on it. Why was this published in an actual journal? Anyone who has gone through the first semester of university already knows that they can do this...