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6 + 10 -z = 9
16 -z = 9
-z = 9-16
-z = -7
z = 7
2x+5y-z=9
2(3)+5(2)-z=9
6+10-z=9
16-z=9
-z=9-16
-z=-7
z=7
jadi
z/-z=7/-7=-1