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Subs.Ke pers 1 dan 3
•pers.1
2(-28+6y+3z)-y+2z=9
-56+12y+6z-y+2z=9
11y+8z =65......5
•pers.3
3(-28+6y+3z)+24+z=16
-84+18y+9z+24+z=16
18y+10z=76
9y+5z=38.......6
jadi x=7
y=-53
z=-29