(a) Complete the story below so that it can be represented by the equation 15x = 19x - 12. Josh is going to...

(a) Complete the story below so that it can be represented by the equation 15x = 19x - 12.
Josh is going to buy x copies of a book.
Store A charges $[ ] per copy, with no other charges or discounts.
Store B charges $[ ] per copy, and there is a $[ ] [Select] shipping charge.
The total cost (with all charges and discounts) is [ ]
(b) Solve for x.
For this equation (and story): x = [ ]