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persamaan 2&3
x+y+z=3
x-y+2z=1
________-
2y-z=2 > persamaan 4
eliminasi x
persamaan 1&3
x-2y+z=0
x-y+2z=1
_______-
-y-z=-1 > persamaan 5
SPLDV pers. 4&5
2y-z=2
-y-z=-1
______-
3y=3
y=1
subsitusikan y pada persamaan 5
-y-z=-1
-1-z=-1
-z=0
z=0
subsitusikan y&z ke pers. 2
x+y+z=3
x+1+0=3
x=2
(2,1,0)
x+y+z= 2+1+0= 3