521259 ÷ 75 
Let's see how many times 75 fits into 521259.

Step 1:
When dividing 5 by 75, we get 0 with a remainder of 5.
The next digit of our result is 0. 
Result so far: 0.0
Deduct 0 from 5 and we're left with 5.
Fetch the next digit (2) from the dividend, attach it to 5 and continue: 52 / 75

On to step 2:
If we divide 52 by 75, we get 0 and a remainder of 52.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtract 0 from 52 to get 52.
Include the next digit (1) from the dividend after 52, then repeat: 521 / 75

Moving on to step 3:
75 goes into 521 6 times with a remainder of 71.
Put 6 as the next digit of the answer. 
Result so far: 6.0
Subtract 450 from 521 to get 71.
Fetch the next digit (2) from the dividend, attach it to 71 and continue: 712 / 75

Let's proceed to step 4:
When dividing 712 by 75, we get 9 with a remainder of 37.
The next digit of our result is 9. 
Result so far: 69.0
Subtracting 675 from 712 leaves us with 37.
Take the next digit (5) from the dividend and append it to 37, then repeat: 375 / 75

Advancing to step 5:
375 divided by 75 is 5 with a remainder of 0.
The next digit of our result is 5. 
Result so far: 695.0
The remainder is 0 after subtracting 375 from 375.
Include the next digit (9) from the dividend after 0, then repeat: 9 / 75

Going ahead to step 6:
75 goes into 9 0 times with a remainder of 9.
Put 0 as the next digit of the answer. 
Result so far: 6950.0
If we take 0 away from 9, we end up with 9.
Since there are no more digits in the dividend, we add a zero to the remainder making it 90, and continue the process.

Moving on to step 7:
The number 75 fits into 90 1 times, leaving a remainder of 15.
The next digit of our result is 1. 
Result so far: 6950.1
The remainder is 15 after subtracting 75 from 90.
Since there are no more digits in the dividend, we add a zero to the remainder making it 150, and continue the process.

Let's proceed to step 8:
75 goes into 150 2 times with a remainder of 0.
Put 2 as the next digit of the answer. 
Result so far: 6950.12
Subtracting 150 from 150 leaves us with 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Advancing to step 9:
75 goes into 0 0 times with a remainder of 0.
Put 0 as the next digit of the answer. 
Result so far: 6950.12
Subtracting 0 from 0 leaves us with 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Moving on to step 10:
The number 75 fits into 0 0 times, leaving a remainder of 0.
Record the quotient 0 as the next digit in the result. 
Result so far: 6950.12
If we take 0 away from 0, we end up with 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

The final outcome is 6950.12, with a leftover of 0.0.