Given:
A number multiplied by - 9, subtracted from the sum of 15 and two times the number.
Let the number = x
A number multiplied by - 9 ⇒ -9x
The sum of 15 and 2 times the number ⇒ 15 + 2x
So, the expression will be ⇒ 15 + 2x - (-9x) = 11x + 15
So, the answer will be ⇒ 11x + 15