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D( z )
z = 0
z = 0
z = 0
z in (-oo:0) U (0:+oo)
(4*z-12)/z = 22 // - 22
(4*z-12)/z-22 = 0
(4*z-12)/z+(-22*z)/z = 0
4*z-22*z-12 = 0
-18*z-12 = 0
(-18*z-12)/z = 0
(-18*z-12)/z = 0 // * z
-18*z-12 = 0
-18*z-12 = 0 // + 12
-18*z = 12 // : -18
z = 12/(-18)
z = -2/3
z = -2/3
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