Suppose you are going on vacation and leaving your dog in a kennel. The Bowowery charges $25 per day, which includes a one-time grooming treatment. The Poochpad charges $20 per day and a one-time fee of $30 for grooming. Write a system of equations to represent the cost "c" for "d" days that your dog will stay at a kennel.

After how many days will the cost be the same?