Question 664253
Let x be the number.

(5 + 2x)-x=9
5 + 2x - x=9
5 + x=9
x=9-5
x=4
 So, the number is 4.

Let's check it by substituting the value of x.

[5 + 2(4)]-4 =9
[5 + 8] - 4 = 9
13 -4=9
9=9