Respuesta :
[ Answer ]
[tex]\boxed{6}[/tex]
[ Explanation ]
X = 15
X - 9
Substitute 15 For X
15 - 9
= 6
[tex]\boxed{[ \ Eclipsed \ ]}[/tex]
The answer is 6 because if x=15 den you would subtract 15 from nine and end up with 6