Hi,

2x+4y+z=-3

3x-4y-z=-22   

3x-4y-z=-22    |multiplying by2 added to second

2x+y+2z=-3

8x - 7y = -47 

-40 - 7y = -47 

   -7y = -7,  

2x+4y+z=-3

 -10 + 4 + z = -3

           z = 3

x=-5, y=1, and z=3  

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