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Which one of the following is equivalent to $\cfrac{4}{2-3i}+\cfrac{2}{1+i}$ ?

A

$\cfrac{6}{3-2i}$

B

$\cfrac{2+i}{5}$

C

$\cfrac{17+3i}{13}$

D

$5-7i$

E

$\cfrac{21-i}{13}$

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