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4x + 2y = 30
4x + y = 25
y= 5
x = 5
Di sub -> x + y + z = 6
5 + 5 + z = 6
z = 6 - 10
z = -4
4x+y=25
-2x=-10
x=5
2x+y=15
2 (5)+y=15
10+y=15
y=5
maka,
x+y+z=6
5+5+z=6
10+z=6
z=-4
jadi nilai z adalah -4