susan needs to get a few repairs on her car before going on vacation. she always takes her car to the car doctors in shelbyville. she needs to get the tires rotated and balanced, which normally costs 38$. the oil also needs to be changed, which costs 35$. in addition to these services, the car doctors will wash, wax, and detail the car for a fee of 23$ per hour. if susan has 165$, what is the maximum number of hours that the car doctors can detail the car?