Answer:
12x+20/5y³
Explanation:
y³ is divided by y⁶ so it leaves y³ at the below and it produces with 5 so we have 5y³ at below. On the above we should not use y³ because it's already divided by y⁶ so we produce 4 and 3x+5 it gives us 12x+20 so the answer is 12x+20/5y³