Answer :

9 - 6x = 45 
-9               -9
_____________
-6x = 54 
 
  x = -9 

________________________
So when you plug that answer into x-4 you get -9 -4, which equals -13. 
9 - 6x = 45 
----        -----
-9          -9

-6x = 54

x = -9

Hope I helped:P 

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