We look at the division of 139728 by 15 
The aim is to understand the frequency of 15 in 139728.

Advancing to step 1:
1 divided by 15 is 0 with a remainder of 1.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtracting 0 from 1 leaves us with 1.
Take the next digit (3) from the dividend and append it to 1, then repeat: 13 / 15

Moving on to step 2:
The number 15 fits into 13 0 times, leaving a remainder of 13.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtracting 0 from 13 leaves us with 13.
Bring next digit (9) of the dividend behind the 13 and repeat the process: 139 / 15

Let's proceed to step 3:
When dividing 139 by 15, we get 9 with a remainder of 4.
Use 9 as the next digit of our solution. 
Result so far: 9.0
If we take 135 away from 139, we end up with 4.
Append the next digit (7) from the dividend to 4 and continue with: 47 / 15

Let's proceed to step 4:
The number 15 fits into 47 3 times, leaving a remainder of 2.
Use 3 as the next digit of our solution. 
Result so far: 93.0
If we take 45 away from 47, we end up with 2.
Append the next digit (2) from the dividend to 2 and continue with: 22 / 15

Going ahead to step 5:
If we divide 22 by 15, we get 1 and a remainder of 7.
The next digit of our result is 1. 
Result so far: 931.0
Subtracting 15 from 22 leaves us with 7.
Append the next digit (8) from the dividend to 7 and continue with: 78 / 15

Step 6:
If we divide 78 by 15, we get 5 and a remainder of 3.
Record the quotient 5 as the next digit in the result. 
Result so far: 9315.0
Subtract 75 from 78 to get 3.
Since there are no more digits in the dividend, we add a zero to the remainder making it 30, and continue the process.

Advancing to step 7:
If we divide 30 by 15, we get 2 and a remainder of 0.
Use 2 as the next digit of our solution. 
Result so far: 9315.2
If we take 30 away from 30, we end up with 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Let's proceed to step 8:
15 can be fit into 0 0 times, resulting in a remainder of 0.
The next digit of our result is 0. 
Result so far: 9315.2
The remainder is 0 after subtracting 0 from 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Step 9:
When dividing 0 by 15, we get 0 with a remainder of 0.
The next digit of our result is 0. 
Result so far: 9315.2
If we take 0 away from 0, we end up with 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Our division results in 9315.2 with a remaining 0.0.