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D( Z )
Z = 0
Z = 0
Z = 0
Z in (-oo:0) U (0:+oo)
10/Z = 5 // - 5
10/Z-5 = 0
10*Z^-1 = 5 // : 10
Z^-1 = 1/2
-1 < 0
1/(Z^1) = 1/2 // * Z^1
1 = 1/2*Z^1 // : 1/2
2 = Z^1
Z = 2
Z = 2
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