A bulldozer is rented at $800 per day plus a charge per hour of use. The bulldozer was used for 5 hours on a day, and the total charge was $3000. Which equation can be used to find the charge x, in dollars, per hour of use? 800 + 5x = 3000 800x + 5 = 3000 800x + 5x = 3000 800 + 5 = 3000x