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x-y=7 (2)
2x+2y-z=6 (3)
Eliminasi 1 dan 3
x+y+z=-3
2x+2y-z=6
------------------+
3x+3y=3
x+y=1 (4)
Eliminasi 2 dan 4
x-y=7
x+y=1
----------+
2x=-6
x=-3
x+y=1
(-3)+y=1
y=4
x+y+z=-3
(-3)+4+z=-3
z=-2
Jadi,
x=-3
y=4
z=-2