Exclamatory because it has an exclamation point
This would be Professional. This person does not show any sign of aggression or anger in this passage. This person isn't using the passage in a funny or sarcastic way and brought up the fact that they would like to work with the company in the future. He told the company he appreciated the time they gave him making this very professional.
3x + 7 = x - 15
First, make sure to subtract

from both sides.
Second, simplify 3x - x to get 2x, and then keep the 7.
Third, subtract

from both sides.
Fourth, simplify -15 - 7 to get -22.
Fifth, take the 2 and divide both sides by it, keeping the

by itself.
Sixth, since 11 goes into 2 to get 22, simplify the fraction to 11.

Answer:
x = -11