57958 ÷ 9 = 6439 R7
Alright, let's work through the division of 57958 by 9 step by step.

Step 1:
9 goes into 5 0 times with a remainder of 5.
Write down 0 as next digit of of the result. 
Result so far: 0
Subtract 0 from 5 to get 5.
Bring next digit (7) of the dividend behind the 5 and repeat the process: 57 / 9

Step 2:
9 goes into 57 6 times with a remainder of 3.
Write down 6 as next digit of of the result. 
Result so far: 6
Subtract 54 from 57 to get 3.
Bring next digit (9) of the dividend behind the 3 and repeat the process: 39 / 9

Step 3:
9 goes into 39 4 times with a remainder of 3.
Write down 4 as next digit of of the result. 
Result so far: 64
Subtract 36 from 39 to get 3.
Bring next digit (5) of the dividend behind the 3 and repeat the process: 35 / 9

Step 4:
9 goes into 35 3 times with a remainder of 8.
Write down 3 as next digit of of the result. 
Result so far: 643
Subtract 27 from 35 to get 8.
Bring next digit (8) of the dividend behind the 8 and repeat the process: 88 / 9

Step 5:
9 goes into 88 9 times with a remainder of 7.
Write down 9 as next digit of of the result. 
Result so far: 6439
Subtract 81 from 88 to get 7.

The final result is 6439 with a remainder of 7.