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D( z )
z = 0
z = 0
z = 0
z in (-oo:0) U (0:+oo)
z/z-(1*3*z)-(3/1) = 0
z/z-3*z-3 = 0
-3*z-2 = 0 // + 2
-3*z = 2 // : -3
z = 2/(-3)
z = -2/3
z = -2/3
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