It is <u>true </u>that one of the principles of communication is that it is repeatable. You can communicate with other people as much as you want to, you can even talk about the same thing over and over again. This means that this type of communication can be repeated, which makes this sentence true.
Answer:
- <u><em>All real numbers except c = 0 and c = 3.</em></u>
Explanation:
The equation is:

Since c - 3, c, and c(c - 3) are he denominators, none of them can be equal to zero:
- c (c - 3) ≠ 0 ⇒ c ≠ 0 and c ≠ 3.
Now you can multiply both sides of the equation by the common denominator: c (c - 3):

That means the equality is valid for all real numbers for which it is defined, which is all real numbers except c = 0 and c = 3.