The function is undefinded if the denominator, x-5, equals 0.
So

.
The domain is

.
In interval notation, this is (-infinity, 5) u (5, infinity).
5x-13=15+7x
-13=15+2x
-28=2x
-14=x
wym are you asking a question?
If you show that the example is showing a false statement then you are disproving the example/problem.
Answer:
C
Step-by-step explanation:
tanA =
=
=
=
→ C