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D( z )
z+2 = 0
z^2-4 = 0
z-2 = 0
z+2 = 0
z+2 = 0
z+2 = 0 // - 2
z = -2
z^2-4 = 0
z^2-4 = 0
1*z^2 = 4 // : 1
z^2 = 4
z^2 = 4 // ^ 1/2
abs(z) = 2
z = 2 or z = -2
z-2 = 0
z-2 = 0
z-2 = 0 // + 2
z = 2
z in (-oo:-2) U (-2:2) U (2:+oo)
(2*z)/(z^2-4) = 2/(z+2)-(1/(z-2)) // - 2/(z+2)-(1/(z-2))
(2*z)/(z^2-4)-(2/(z+2))+1/(z-2) = 0
(2*z)/(z^2-4)-2*(z+2)^-1+1/(z-2) = 0
(2*z)/(z^2-4)-2/(z+2)+1/(z-2) = 0
(2*z*(z+2)*(z-2))/((z^2-4)*(z+2)*(z-2))+(-2*(z^2-4)*(z-2))/((z^2-4)*(z+2)*(z-2))+(1*(z^2-4)*(z+2))/((z^2-4)*(z+2)*(z-2)) = 0
2*z*(z+2)*(z-2)-2*(z^2-4)*(z-2)+1*(z^2-4)*(z+2) = 0
z^3+4*z^2+2*z^2-4*z-16-8 = 0
z^3+6*z^2-4*z-24 = 0
z^3+6*z^2-4*z-24 = 0
z^3+6*z^2-4*z-24
z^2*(z+6)-4*z-24
z^2*(z+6)-4*(z+6)
(z^2-4)*(z+6)
((z^2-4)*(z+6))/((z^2-4)*(z+2)*(z-2)) = 0
((z^2-4)*(z+6))/((z^2-4)*(z+2)*(z-2)) = 0 // * (z^2-4)*(z+2)*(z-2)
(z^2-4)*(z+6) = 0
( z+6 )
z+6 = 0 // - 6
z = -6
( z^2-4 )
1*z^2 = 4 // : 1
z^2 = 4
z^2 = 4 // ^ 1/2
abs(z) = 2
z = 2 or z = -2
z in { 2}
z in { -2}
z = -6
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