390286 ÷ 7 
The aim is to understand the frequency of 7 in 390286.

Going ahead to step 1:
3 divided by 7 is 0 with a remainder of 3.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtracting 0 from 3 leaves us with 3.
Take the next digit (9) from the dividend and append it to 3, then repeat: 39 / 7

Moving on to step 2:
When dividing 39 by 7, we get 5 with a remainder of 4.
Put 5 as the next digit of the answer. 
Result so far: 5.0
Subtract 35 from 39 to get 4.
Bring next digit (0) of the dividend behind the 4 and repeat the process: 40 / 7

Moving on to step 3:
7 goes into 40 5 times with a remainder of 5.
Use 5 as the next digit of our solution. 
Result so far: 55.0
If we subtract 35 from 40, we get 5.
Take the next digit (2) from the dividend and append it to 5, then repeat: 52 / 7

On to step 4:
7 goes into 52 7 times with a remainder of 3.
Write down 7 as next digit of the result. 
Result so far: 557.0
The remainder is 3 after subtracting 49 from 52.
Fetch the next digit (8) from the dividend, attach it to 3 and continue: 38 / 7

Advancing to step 5:
7 goes into 38 5 times with a remainder of 3.
Put 5 as the next digit of the answer. 
Result so far: 5575.0
Subtracting 35 from 38 leaves us with 3.
Include the next digit (6) from the dividend after 3, then repeat: 36 / 7

Step 6:
When dividing 36 by 7, we get 5 with a remainder of 1.
Put 5 as the next digit of the answer. 
Result so far: 55755.0
Subtract 35 from 36 to get 1.
Since there are no more digits in the dividend, we add a zero to the remainder making it 10, and continue the process.

Step 7:
The number 7 fits into 10 1 times, leaving a remainder of 3.
The number 1 becomes the next digit in our result. 
Result so far: 55755.1
If we take 7 away from 10, we end up with 3.
Since there are no more digits in the dividend, we add a zero to the remainder making it 30, and continue the process.

Let's proceed to step 8:
7 goes into 30 4 times with a remainder of 2.
The next digit of our result is 4. 
Result so far: 55755.14
The remainder is 2 after subtracting 28 from 30.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

Step 9:
7 goes into 20 2 times with a remainder of 6.
Put 2 as the next digit of the answer. 
Result so far: 55755.142
The remainder is 6 after subtracting 14 from 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

Let's proceed to step 10:
When dividing 60 by 7, we get 8 with a remainder of 4.
Write down 8 as next digit of the result. 
Result so far: 55755.1428
Subtract 56 from 60 to get 4.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

On to step 11:
When dividing 40 by 7, we get 5 with a remainder of 5.
Write down 5 as next digit of the result. 
Result so far: 55755.14285
The remainder is 5 after subtracting 35 from 40.
Since there are no more digits in the dividend, we add a zero to the remainder making it 50, and continue the process.

Let's proceed to step 12:
50 divided by 7 is 7 with a remainder of 1.
Use 7 as the next digit of our solution. 
Result so far: 55755.142857
Subtracting 49 from 50 leaves us with 1.
Since there are no more digits in the dividend, we add a zero to the remainder making it 10, and continue the process.

Going ahead to step 13:
7 goes into 10 1 times with a remainder of 3.
Write down 1 as next digit of the result. 
Result so far: 55755.1428571
If we take 7 away from 10, we end up with 3.
Since there are no more digits in the dividend, we add a zero to the remainder making it 30, and continue the process.

On to step 14:
The number 7 fits into 30 4 times, leaving a remainder of 2.
The next digit of our result is 4. 
Result so far: 55755.14285714
Subtracting 28 from 30 leaves us with 2.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

The final result is 55755.14285714 with a remainder of 2e-09.