Respuesta :

myuuu
the missing side (x) would be 12
it looks to me like this 
the side that's 2 was multiplied by 3 to get 6 
and the side that's 3 was multiplied by 3 to get 9 
so the side that's 4 will be multiplied by 3 to get 12 

12 is the answer 

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good job