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x+y+z=9. |x2| 2x+2y+2z= 18
------------------------ -
y-3z=-13
x+y+z= 9
x-2y-z=-7
-------------- -
3y+2z=16
y-3z=-13. |x3| 3y-9z=-39
3y+2z=16 |x1| 3y+2z=16
----------------- -
-11z= -55
z=5
y-3(5)=-13
y-15=-13
y=2
x+2+5=9
x+7=9
x=2