Let m = monomial
Let t = trinomial
So, m times t = t.
monomial times a trinomial = another trinomial.
0=-12 is not true.
What this means is that there is no solution, and that the equation will always be false no matter the value of the variable.
If you look at the graph, you can see that at 5 packages, 2 stops have been made. Look at the image I have attached for additional help if you need it.