We're dividing 76007215 by 121 
The aim is to understand the frequency of 121 in 76007215.

Let's proceed to step 1:
7 divided by 121 is 0 with a remainder of 7.
The next digit of our result is 0. 
Result so far: 0.0
Deduct 0 from 7 and we're left with 7.
Take the next digit (6) from the dividend and append it to 7, then repeat: 76 / 121

Going ahead to step 2:
When dividing 76 by 121, we get 0 with a remainder of 76.
The next digit of our result is 0. 
Result so far: 0.0
If we take 0 away from 76, we end up with 76.
Fetch the next digit (0) from the dividend, attach it to 76 and continue: 760 / 121

On to step 3:
760 divided by 121 is 6 with a remainder of 34.
Write down 6 as next digit of the result. 
Result so far: 6.0
If we subtract 726 from 760, we get 34.
Append the next digit (0) from the dividend to 34 and continue with: 340 / 121

Moving on to step 4:
When dividing 340 by 121, we get 2 with a remainder of 98.
Use 2 as the next digit of our solution. 
Result so far: 62.0
Subtract 242 from 340 to get 98.
Bring next digit (7) of the dividend behind the 98 and repeat the process: 987 / 121

On to step 5:
If we divide 987 by 121, we get 8 and a remainder of 19.
Write down 8 as next digit of the result. 
Result so far: 628.0
Subtracting 968 from 987 leaves us with 19.
Include the next digit (2) from the dividend after 19, then repeat: 192 / 121

Step 6:
121 can be fit into 192 1 times, resulting in a remainder of 71.
Put 1 as the next digit of the answer. 
Result so far: 6281.0
The remainder is 71 after subtracting 121 from 192.
Fetch the next digit (1) from the dividend, attach it to 71 and continue: 711 / 121

Step 7:
The number 121 fits into 711 5 times, leaving a remainder of 106.
Record the quotient 5 as the next digit in the result. 
Result so far: 62815.0
Subtract 605 from 711 to get 106.
Take the next digit (5) from the dividend and append it to 106, then repeat: 1065 / 121

On to step 8:
The number 121 fits into 1065 8 times, leaving a remainder of 97.
The number 8 becomes the next digit in our result. 
Result so far: 628158.0
The remainder is 97 after subtracting 968 from 1065.
Since there are no more digits in the dividend, we add a zero to the remainder making it 970, and continue the process.

Going ahead to step 9:
When dividing 970 by 121, we get 8 with a remainder of 2.
Record the quotient 8 as the next digit in the result. 
Result so far: 628158.8
If we subtract 968 from 970, we get 2.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

Moving on to step 10:
121 goes into 20 0 times with a remainder of 20.
The number 0 becomes the next digit in our result. 
Result so far: 628158.8
Subtract 0 from 20 to get 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

Let's proceed to step 11:
When dividing 200 by 121, we get 1 with a remainder of 79.
The next digit of our result is 1. 
Result so far: 628158.801
Deduct 121 from 200 and we're left with 79.
Since there are no more digits in the dividend, we add a zero to the remainder making it 790, and continue the process.

On to step 12:
If we divide 790 by 121, we get 6 and a remainder of 64.
The next digit of our result is 6. 
Result so far: 628158.8016
The remainder is 64 after subtracting 726 from 790.
Since there are no more digits in the dividend, we add a zero to the remainder making it 640, and continue the process.

Step 13:
121 can be fit into 640 5 times, resulting in a remainder of 35.
Put 5 as the next digit of the answer. 
Result so far: 628158.80165
The remainder is 35 after subtracting 605 from 640.
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 14:
121 can be fit into 350 2 times, resulting in a remainder of 108.
Put 2 as the next digit of the answer. 
Result so far: 628158.801652
If we subtract 242 from 350, we get 108.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1080, and continue the process.

On to step 15:
121 can be fit into 1080 8 times, resulting in a remainder of 112.
Use 8 as the next digit of our solution. 
Result so far: 628158.8016528
Subtract 968 from 1080 to get 112.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1120, and continue the process.

Advancing to step 16:
1120 divided by 121 is 9 with a remainder of 31.
The number 9 becomes the next digit in our result. 
Result so far: 628158.80165289
Subtracting 1089 from 1120 leaves us with 31.
Since there are no more digits in the dividend, we add a zero to the remainder making it 310, and continue the process.

The final outcome is 628158.80165289, with a leftover of 3.1e-08.