The expression is as follows:
(x + 4) / 3 ← Three
↑ ↑
| Divided by
The sum of x and 4 all
I think you meant to say to evalutewhen x = 5 and when x = 20.
Now we plug in the numbers and solve:
(x + 4) / 3
(5 + 4) / 3
9/3
3
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(20 + 4) / 3
24/3
8