I need to find the x pls help and show work

Answer:
[tex]--------------------------------------------[/tex]
It is 9
[tex]--------------------------------------------[/tex]
Step-by-step explanation:
[tex]--------------------------------------------[/tex]
If the top and the bottom are the same, (shown in the larger model), then the top and bottom in the smaller model should be the same, which gives me 9.
[tex]--------------------------------------------[/tex]
Good luck!