We look at the division of 521528 by 85 
The aim is to understand the frequency of 85 in 521528.

Advancing to step 1:
The number 85 fits into 5 0 times, leaving a remainder of 5.
The next digit of our result is 0. 
Result so far: 0.0
If we take 0 away from 5, we end up with 5.
Append the next digit (2) from the dividend to 5 and continue with: 52 / 85

Moving on to step 2:
When dividing 52 by 85, we get 0 with a remainder of 52.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Deduct 0 from 52 and we're left with 52.
Fetch the next digit (1) from the dividend, attach it to 52 and continue: 521 / 85

On to step 3:
85 goes into 521 6 times with a remainder of 11.
Write down 6 as next digit of the result. 
Result so far: 6.0
The remainder is 11 after subtracting 510 from 521.
Grab the next digit (5) from the dividend, add it to 11, then carry on: 115 / 85

On to step 4:
If we divide 115 by 85, we get 1 and a remainder of 30.
Use 1 as the next digit of our solution. 
Result so far: 61.0
The remainder is 30 after subtracting 85 from 115.
Take the next digit (2) from the dividend and append it to 30, then repeat: 302 / 85

On to step 5:
The number 85 fits into 302 3 times, leaving a remainder of 47.
The number 3 becomes the next digit in our result. 
Result so far: 613.0
If we subtract 255 from 302, we get 47.
Fetch the next digit (8) from the dividend, attach it to 47 and continue: 478 / 85

Moving on to step 6:
When dividing 478 by 85, we get 5 with a remainder of 53.
Record the quotient 5 as the next digit in the result. 
Result so far: 6135.0
Subtracting 425 from 478 leaves us with 53.
Since there are no more digits in the dividend, we add a zero to the remainder making it 530, and continue the process.

Advancing to step 7:
If we divide 530 by 85, we get 6 and a remainder of 20.
Record the quotient 6 as the next digit in the result. 
Result so far: 6135.6
The remainder is 20 after subtracting 510 from 530.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

Moving on to step 8:
200 divided by 85 is 2 with a remainder of 30.
Put 2 as the next digit of the answer. 
Result so far: 6135.62
Deduct 170 from 200 and we're left with 30.
Since there are no more digits in the dividend, we add a zero to the remainder making it 300, and continue the process.

Going ahead to step 9:
If we divide 300 by 85, we get 3 and a remainder of 45.
The next digit of our result is 3. 
Result so far: 6135.623
If we take 255 away from 300, we end up with 45.
Since there are no more digits in the dividend, we add a zero to the remainder making it 450, and continue the process.

Moving on to step 10:
When dividing 450 by 85, we get 5 with a remainder of 25.
The number 5 becomes the next digit in our result. 
Result so far: 6135.6235
Deduct 425 from 450 and we're left with 25.
Since there are no more digits in the dividend, we add a zero to the remainder making it 250, and continue the process.

Let's proceed to step 11:
250 divided by 85 is 2 with a remainder of 80.
Put 2 as the next digit of the answer. 
Result so far: 6135.62352
The remainder is 80 after subtracting 170 from 250.
Since there are no more digits in the dividend, we add a zero to the remainder making it 800, and continue the process.

Moving on to step 12:
85 goes into 800 9 times with a remainder of 35.
The number 9 becomes the next digit in our result. 
Result so far: 6135.623529
If we subtract 765 from 800, we get 35.
Since there are no more digits in the dividend, we add a zero to the remainder making it 350, and continue the process.

On to step 13:
85 can be fit into 350 4 times, resulting in a remainder of 10.
Record the quotient 4 as the next digit in the result. 
Result so far: 6135.6235294
If we take 340 away from 350, we end up with 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Let's proceed to step 14:
85 goes into 100 1 times with a remainder of 15.
The number 1 becomes the next digit in our result. 
Result so far: 6135.62352941
If we take 85 away from 100, we end up with 15.
Since there are no more digits in the dividend, we add a zero to the remainder making it 150, and continue the process.

In conclusion, the division gives 6135.62352941 with a balance of 1.5e-08.