Given the problem: THE SUM OF A NUMBER X AND -4 ALL DIVIDED BY 3.
This problem looks like it's asking you to write an expression.
So of course, "a number" will be x in this problem.
Sum is the answer to addition.
So the sum of a number (x) and -4 will be x + -4, or x - 4.
Then, we'll take that and divide it by 3.
So you should have:
(x - 4)/3
Hope this helped!