Step 1. Set up long division 
 _______
7| 1 9 8 6
Step 2. Calculate 19 ÷ 7, which is 2 with a remainder of 5.
 2
 _______
7| 1 9 8 6
 1 4
_________
 5
 Step 3. Bring down 8, so that 58 is large enough to be divided by 7.
 2
 _______
7| 1 9 8 6
 1 4
_________
 5 8
Step 4. Calculate 58 ÷ 7, which is 8 with a remainder of 2.
 2 8
 _______
7| 1 9 8 6
 1 4
_________
 5 8
 5 6
_________
 2
Step 5. Bring down 6, so that 26 is large enough to be divided by 7.
 2 8
 _______
7| 1 9 8 6
 1 4
_________
 5 8
 5 6
_______
 2 6
Step 6. Calculate 26 ÷ 7, which is 3 with a remainder of 5.
  
 2 8 3
 _______
7| 1 9 8 6
 1 4
_________
 5 8
 5 6
_______
 2 6
 2 1
 ______
 5
Step 7. Therefore, 1986 ÷ 7 = 283 with a remainder of 5.
823 With a remainder of 5
Done!
Decimal Form If Needed: 283.714286