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x+y+z=12
2x-y+2z=12
2x+2y-z=18
elimi pers 1 & 2
x+y+z=12
2x-y+2z=12
___________+
3x+3z=24......(4)
elimi pers 1 & 3
x+ y+z=12[2]2x+2y+2z=24
2x+2y-z=18[1] 2x+2y-z=18
_____________-
3z=6
z=2
subs z=2 ke pers 4
3x+3z=24
3x+3(2)=24
3x+6=24
3x=24-6
3x=18
x=9
subs x=9 & z=2 ke pers 1
x+y+z=12
9+y+2=12
11+y=12
y=12-11
y=1
no. 2ny aku kirim lewat pesan.