So, your question rephrased is: 3∗5−9.
Using the order of operations, we do the multiplication first.
3∗5 is 3 sets of 5, meaning that you add 5 to itself 3 times. This is 5+5+5=15.
So, our equation now is 15−9.
Using the method of subtraction, we get 15−9=6,
So, the answer to the equation 3∗5−9 is 6 :D