66426 ÷ 9 = 7380 R6
Alright, let's work through the division of 66426 by 9 step by step.

Step 1:
9 goes into 6 0 times with a remainder of 6.
Write down 0 as next digit of of the result. 
Result so far: 0
Subtract 0 from 6 to get 6.
Bring next digit (6) of the dividend behind the 6 and repeat the process: 66 / 9

Step 2:
9 goes into 66 7 times with a remainder of 3.
Write down 7 as next digit of of the result. 
Result so far: 7
Subtract 63 from 66 to get 3.
Bring next digit (4) of the dividend behind the 3 and repeat the process: 34 / 9

Step 3:
9 goes into 34 3 times with a remainder of 7.
Write down 3 as next digit of of the result. 
Result so far: 73
Subtract 27 from 34 to get 7.
Bring next digit (2) of the dividend behind the 7 and repeat the process: 72 / 9

Step 4:
9 goes into 72 8 times with a remainder of 0.
Write down 8 as next digit of of the result. 
Result so far: 738
Subtract 72 from 72 to get 0.
Bring next digit (6) of the dividend behind the 0 and repeat the process: 6 / 9

Step 5:
9 goes into 6 0 times with a remainder of 6.
Write down 0 as next digit of of the result. 
Result so far: 7380
Subtract 0 from 6 to get 6.

The final result is 7380 with a remainder of 6.