The sum of four consecutive 3 digit numbers is3990 what are the 4 numbers?

The sum of four consecutive 3 digit numbers is3990 what are the 4 numbers?
You can solve this problem algebraically:

(X) + (X+1) + (X+2) + (X+3) = 3990
4X + 6 = 3990
4X + 6 - 6 = 3990 - 6
4X = 3984
4X/4 = 3984/4
X = 996

Therefore, the 4 numbers are
996, 997, 998, 999

996 + 997 + 998 + 999 = 3990