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y = 3
y + 1 = z - 5
3 + 1 = z - 5
z = 9
2x - y = z
2x - 3 = 9
2x = 12
x = 6
maka
x = 6
y = 3
z = 9
3 = y
y+1 = z-5
y+1 = z-5
3+1 = z-5
4 = z-5
z = 4+5
z = 9
2x-y = z
2x-3 = 9
2x = 9+3
2x = 12
x = 6
jadi, x=6, y=3, z=9