Hi,

3x=-12  0r x = -4

 2x-y+3z=-1

 3x+4-z=-7



-8-y+3x = -1    |Substituting x = -4

-12-y -z = -1



-y + 3z = 7

-y -  z = 11



-y + 3z = 7

y  + z = -11   |Multiplying 2nd EQ by -1

   4z = -4

    z = -1   and y = -10 

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