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D( z )
z = 0
z = 0
z = 0
z in (-oo:0) U (0:+oo)
36/z+10 = 14 // - 14
36/z-14+10 = 0
36*z^-1 = 4 // : 36
z^-1 = 1/9
-1 < 0
1/(z^1) = 1/9 // * z^1
1 = 1/9*z^1 // : 1/9
9 = z^1
z = 9
z = 9
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