A number is doubled and 9 is added. If the resultant is tripled, it becomes 75. What is the number?

Let the number be N.
According to question,
A number is doubled and 9 is added then 2N + 9
Again According to question,
If the resultant is tripled, it becomes 75.
3 ( 2N + 9 ) = 75
⇒ 2N + 9 = 25
⇒2N =16
⇒ N = 8