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Given the system of equations:

{2x-3y-9z=21x+3z=-12-3x+y-4z=21

(a) Determine the type of system:

(b) If your answer is dependent in (a), find the complete solution.
Write x, y as functions of t, where z=t.

If your answer is inconsistent, write DNE for all three variables.

x=  
y=  
z=  

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