7/x-1 fractie subunitara?

Răspuns :

[tex] \frac{7}{x - 1} [/tex]

x€{9,10,11,12,13,14,...}
7<9-1
7<10-1
....
7/(x-1) fractie subunitara =>

7 < x - 1 

8 < 8

=> x 
∈ [ 9 , +oo