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3x+y+z = 3
------------------ +
4x+3y = 12 ..... (i)
x+2y-z = 9
3x-y+z = -2
----------------- +
4x + y = 7 ...... (ii)
4x+3y = 12
4x+y = 7
------------------- -
2y = 5
y = 5/2
4x+y = 7 x+2y-z = 9
4x+5/2 = 7 11/8+2(5/2)-z = 9
4x = 11/2 11/8+5-z = 9
x = 11/8 51/8-z = 9
-z = 9-51/8
-z = 21/8 ---> z= -21/8