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2x-y+2z=4 (2)
x+3y-3z=36 (3)
pers 1 dan 2
x+y-z=24 | 2x-y+2z=4 (+)
3x+z=28
pers 1 dan 3
3x+3y-3z=72 | x+3y-3z=36 (-)
2x=36
x=18
3(18)+z=28 => 54-28=-z =>
z=-26
18+y-(-26)=24
34+y=24
y=24-34
y= -10