The equation you were originally given was meant to be incomplete, and you are supposed to complete and balance it. What you are learning in your books will apply to this question, but this question is a bit more demanding. You are not far off from getting this I assure you.

So in Borek's equation, there is not enough Ch on the left, so it is not balanced. How can we sort that out?

At this point, don't worry yourself too much about how this relates to the charge problem in your equation - it will become clear soon. Focus on balancing Borek's equation, it is the key.