Help me ! I rly need to finish this home work before the dead line the deadline is in 30 mins plz help

Answer:
The answer is a= 15
Step-by-step explanation:
First, you multiply both sides by 5. 5*3 = 15 and a/5*5 = a, since 5 and 5 cancels out each other. This is optional, then you flip the equation to get a= 15. Hope this helps.