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D( z )
(z-8)/22 = 0
(z-8)/22 = 0
(z-8)/22 = 0
z-8 = 0 // + 8
z = 8
z in (-oo:8) U (8:+oo)
((2*z-16)/121)/((z-8)/22) = 0
(22*(2*z-16))/(121*(z-8)) = 0
2*z-16 = 0 // + 16
2*z = 16 // : 2
z = 16/2
z = 8
z in { 8}
z belongs to the empty set
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