We look at the division of 151920 by 84 
The aim is to understand the frequency of 84 in 151920.

Advancing to step 1:
When dividing 1 by 84, we get 0 with a remainder of 1.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we take 0 away from 1, we end up with 1.
Grab the next digit (5) from the dividend, add it to 1, then carry on: 15 / 84

Advancing to step 2:
The number 84 fits into 15 0 times, leaving a remainder of 15.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtracting 0 from 15 leaves us with 15.
Grab the next digit (1) from the dividend, add it to 15, then carry on: 151 / 84

Moving on to step 3:
84 can be fit into 151 1 times, resulting in a remainder of 67.
The next digit of our result is 1. 
Result so far: 1.0
Subtracting 84 from 151 leaves us with 67.
Include the next digit (9) from the dividend after 67, then repeat: 679 / 84

Let's proceed to step 4:
679 divided by 84 is 8 with a remainder of 7.
The next digit of our result is 8. 
Result so far: 18.0
Subtract 672 from 679 to get 7.
Bring next digit (2) of the dividend behind the 7 and repeat the process: 72 / 84

On to step 5:
When dividing 72 by 84, we get 0 with a remainder of 72.
The number 0 becomes the next digit in our result. 
Result so far: 180.0
The remainder is 72 after subtracting 0 from 72.
Bring next digit (0) of the dividend behind the 72 and repeat the process: 720 / 84

Step 6:
The number 84 fits into 720 8 times, leaving a remainder of 48.
The next digit of our result is 8. 
Result so far: 1808.0
Deduct 672 from 720 and we're left with 48.
Since there are no more digits in the dividend, we add a zero to the remainder making it 480, and continue the process.

Advancing to step 7:
When dividing 480 by 84, we get 5 with a remainder of 60.
The next digit of our result is 5. 
Result so far: 1808.5
Deduct 420 from 480 and we're left with 60.
Since there are no more digits in the dividend, we add a zero to the remainder making it 600, and continue the process.

Step 8:
84 goes into 600 7 times with a remainder of 12.
Use 7 as the next digit of our solution. 
Result so far: 1808.57
If we take 588 away from 600, we end up with 12.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

Let's proceed to step 9:
The number 84 fits into 120 1 times, leaving a remainder of 36.
Record the quotient 1 as the next digit in the result. 
Result so far: 1808.571
If we take 84 away from 120, we end up with 36.
Since there are no more digits in the dividend, we add a zero to the remainder making it 360, and continue the process.

Let's proceed to step 10:
The number 84 fits into 360 4 times, leaving a remainder of 24.
Record the quotient 4 as the next digit in the result. 
Result so far: 1808.5714
If we subtract 336 from 360, we get 24.
Since there are no more digits in the dividend, we add a zero to the remainder making it 240, and continue the process.

Let's proceed to step 11:
84 can be fit into 240 2 times, resulting in a remainder of 72.
The next digit of our result is 2. 
Result so far: 1808.57142
The remainder is 72 after subtracting 168 from 240.
Since there are no more digits in the dividend, we add a zero to the remainder making it 720, and continue the process.

On to step 12:
720 divided by 84 is 8 with a remainder of 48.
Use 8 as the next digit of our solution. 
Result so far: 1808.571428
Deduct 672 from 720 and we're left with 48.
Since there are no more digits in the dividend, we add a zero to the remainder making it 480, and continue the process.

Going ahead to step 13:
84 goes into 480 5 times with a remainder of 60.
Use 5 as the next digit of our solution. 
Result so far: 1808.5714285
If we take 420 away from 480, we end up with 60.
Since there are no more digits in the dividend, we add a zero to the remainder making it 600, and continue the process.

Let's proceed to step 14:
600 divided by 84 is 7 with a remainder of 12.
Use 7 as the next digit of our solution. 
Result so far: 1808.57142857
If we take 588 away from 600, we end up with 12.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

The final result is 1808.57142857 with a remainder of 1.2e-08.