/ 7*z \ z + 3 |z - -----|*----- \ z + 3/ z - 4
(z - 7*z/(z + 3))*((z + 3)/(z - 4))
/ 7*z \ (3 + z)*|z - -----| \ 3 + z/ ------------------- -4 + z
(3 + z)*(z - 7*z/(3 + z))/(-4 + z)
(3.0 + z)*(z - 7.0*z/(3.0 + z))/(-4.0 + z)
(3.0 + z)*(z - 7.0*z/(3.0 + z))/(-4.0 + z)
/ 7*z \ (3 + z)*|z - -----| \ 3 + z/ ------------------- -4 + z
(3 + z)*(z - 7*z/(3 + z))/(-4 + z)
/ 7*z \ (3 + z)*|z - -----| \ 3 + z/ ------------------- -4 + z
(3 + z)*(z - 7*z/(3 + z))/(-4 + z)