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D( z )
z = 0
z = 0
z = 0
z in (-oo:0) U (0:+oo)
(z+1)/z = 7/6 // - 7/6
(z+1)/z-(7/6) = 0
(z+1)/z-7/6 = 0
(6*(z+1))/(6*z)+(-7*z)/(6*z) = 0
6*(z+1)-7*z = 0
6-z = 0
(6-z)/(6*z) = 0
(6-z)/(6*z) = 0 // * 6*z
6-z = 0
6-z = 0 // - 6
-z = -6 // * -1
z = 6
z = 6
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