Find A-1 then use it to find the solution to the system.
A. A-1 = - 
; x = - 
, y = - 
, z = 
B. A-1 = - 
; x = 
, y = 
, z = - 
C.
A-1 = -   ; | x =  , y =  , z = -  |
D. A-1 = -
; x = 
, y = 
, z = - 
Answer: D
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