We're dividing 673978 by 21 
We want to divide 673978 by 21.

Step 1:
21 goes into 6 0 times with a remainder of 6.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
The remainder is 6 after subtracting 0 from 6.
Fetch the next digit (7) from the dividend, attach it to 6 and continue: 67 / 21

On to step 2:
67 divided by 21 is 3 with a remainder of 4.
Record the quotient 3 as the next digit in the result. 
Result so far: 3.0
If we take 63 away from 67, we end up with 4.
Grab the next digit (3) from the dividend, add it to 4, then carry on: 43 / 21

Let's proceed to step 3:
If we divide 43 by 21, we get 2 and a remainder of 1.
Record the quotient 2 as the next digit in the result. 
Result so far: 32.0
Deduct 42 from 43 and we're left with 1.
Bring next digit (9) of the dividend behind the 1 and repeat the process: 19 / 21

Step 4:
When dividing 19 by 21, we get 0 with a remainder of 19.
Record the quotient 0 as the next digit in the result. 
Result so far: 320.0
Subtract 0 from 19 to get 19.
Bring next digit (7) of the dividend behind the 19 and repeat the process: 197 / 21

Advancing to step 5:
21 goes into 197 9 times with a remainder of 8.
The next digit of our result is 9. 
Result so far: 3209.0
If we subtract 189 from 197, we get 8.
Fetch the next digit (8) from the dividend, attach it to 8 and continue: 88 / 21

Moving on to step 6:
21 can be fit into 88 4 times, resulting in a remainder of 4.
Put 4 as the next digit of the answer. 
Result so far: 32094.0
Subtract 84 from 88 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.

Let's proceed to step 7:
When dividing 40 by 21, we get 1 with a remainder of 19.
Write down 1 as next digit of the result. 
Result so far: 32094.1
Deduct 21 from 40 and we're left with 19.
Since there are no more digits in the dividend, we add a zero to the remainder making it 190, and continue the process.

Advancing to step 8:
If we divide 190 by 21, we get 9 and a remainder of 1.
The next digit of our result is 9. 
Result so far: 32094.19
If we take 189 away from 190, we end up 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.

Let's proceed to step 9:
10 divided by 21 is 0 with a remainder of 10.
Record the quotient 0 as the next digit in the result. 
Result so far: 32094.19
If we take 0 away from 10, 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.

Step 10:
21 can be fit into 100 4 times, resulting in a remainder of 16.
The next digit of our result is 4. 
Result so far: 32094.1904
Deduct 84 from 100 and we're left with 16.
Since there are no more digits in the dividend, we add a zero to the remainder making it 160, and continue the process.

Going ahead to step 11:
21 can be fit into 160 7 times, resulting in a remainder of 13.
Use 7 as the next digit of our solution. 
Result so far: 32094.19047
Subtracting 147 from 160 leaves us with 13.
Since there are no more digits in the dividend, we add a zero to the remainder making it 130, and continue the process.

Let's proceed to step 12:
If we divide 130 by 21, we get 6 and a remainder of 4.
Record the quotient 6 as the next digit in the result. 
Result so far: 32094.190476
The remainder is 4 after subtracting 126 from 130.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

Moving on to step 13:
40 divided by 21 is 1 with a remainder of 19.
The number 1 becomes the next digit in our result. 
Result so far: 32094.1904761
If we take 21 away from 40, we end up with 19.
Since there are no more digits in the dividend, we add a zero to the remainder making it 190, and continue the process.

Going ahead to step 14:
When dividing 190 by 21, we get 9 with a remainder of 1.
The number 9 becomes the next digit in our result. 
Result so far: 32094.19047619
Subtract 189 from 190 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.

In conclusion, the division gives 32094.19047619 with a balance of 1e-09.