$(a)\;- \large\frac{11}{5} - \large\frac{21}{5}i\qquad(b)\;- \large\frac{19}{5} - \large\frac{21}{10}i\qquad(c)\;- \large\frac{18}{5} - \large\frac{21}{10}i\qquad(d)\;- \large\frac{19}{10} - \large\frac{21}{5}i$