(3х-4у-1)/(х-5)*(у+3) = (3х-4у-1)(у+3)/(х-5)
Expanding the numerator:
= 3ху + 9х - 4у² - 12у - у - 3 / (х-5)

= 3ху + 9х - 4у² - у - 12у - 3 / (х-5)

So, (3х-4у-1)/(х-5)*(у+3) = 3ху + 9х - 4у² - у - 12у - 3 / (х-5)