I have done the multiplication to get a matrix but I don't know what equations should be produced after that.
Rather than casting aspersions on the mathematical capability of the many people who give their valuable time and expertise for free helping people, I would suggest that a more accurate observation is that it's a question few people here had the time or inclination to do. (Posting the question in a more appropriate subforum (I've moved it from Pre-algebra to here) might have facilitated getting more responses).