We're dividing 66343739 by 77 
The aim is to understand the frequency of 77 in 66343739.

Let's proceed to step 1:
If we divide 6 by 77, we get 0 and a remainder of 6.
Use 0 as the next digit of our solution. 
Result so far: 0.0
The remainder is 6 after subtracting 0 from 6.
Bring next digit (6) of the dividend behind the 6 and repeat the process: 66 / 77

Step 2:
77 goes into 66 0 times with a remainder of 66.
The next digit of our result is 0. 
Result so far: 0.0
The remainder is 66 after subtracting 0 from 66.
Take the next digit (3) from the dividend and append it to 66, then repeat: 663 / 77

On to step 3:
77 can be fit into 663 8 times, resulting in a remainder of 47.
Record the quotient 8 as the next digit in the result. 
Result so far: 8.0
Deduct 616 from 663 and we're left with 47.
Append the next digit (4) from the dividend to 47 and continue with: 474 / 77

Step 4:
If we divide 474 by 77, we get 6 and a remainder of 12.
Record the quotient 6 as the next digit in the result. 
Result so far: 86.0
The remainder is 12 after subtracting 462 from 474.
Grab the next digit (3) from the dividend, add it to 12, then carry on: 123 / 77

On to step 5:
The number 77 fits into 123 1 times, leaving a remainder of 46.
Use 1 as the next digit of our solution. 
Result so far: 861.0
Subtract 77 from 123 to get 46.
Include the next digit (7) from the dividend after 46, then repeat: 467 / 77

On to step 6:
When dividing 467 by 77, we get 6 with a remainder of 5.
Put 6 as the next digit of the answer. 
Result so far: 8616.0
If we subtract 462 from 467, we get 5.
Include the next digit (3) from the dividend after 5, then repeat: 53 / 77

On to step 7:
77 can be fit into 53 0 times, resulting in a remainder of 53.
Write down 0 as next digit of the result. 
Result so far: 86160.0
Deduct 0 from 53 and we're left with 53.
Take the next digit (9) from the dividend and append it to 53, then repeat: 539 / 77

Moving on to step 8:
77 goes into 539 7 times with a remainder of 0.
Write down 7 as next digit of the result. 
Result so far: 861607.0
The remainder is 0 after subtracting 539 from 539.
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:
If we divide 0 by 77, we get 0 and a remainder of 0.
Use 0 as the next digit of our solution. 
Result so far: 861607.0
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.

Let's proceed to step 10:
77 can be fit into 0 0 times, resulting in a remainder of 0.
Write down 0 as next digit of the result. 
Result so far: 861607.0
If we subtract 0 from 0, we get 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

In conclusion, the division gives 861607.0 with a balance of 0.0.