$$(\frac{1}{5}+\frac{2i}{5})-(4+\frac{5}{2}i)$$
$-\frac{19}{5}-\frac{21}{10}i=-3.8-2.1i$
$$\frac{1}{5}+\frac{2}{5}i-\left(4+\frac{5}{2}i\right)$$
$$\frac{1}{5}-4+\left(\frac{2}{5}-\frac{5}{2}\right)i$$
$$-\frac{19}{5}-\frac{21}{10}i$$
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$-\frac{19}{5} = -3\frac{4}{5} = -3.8$
$$Re(\frac{1}{5}+\frac{2}{5}i-\left(4+\frac{5}{2}i\right))$$
$$Re(\frac{1}{5}-4+\left(\frac{2}{5}-\frac{5}{2}\right)i)$$
$$Re(-\frac{19}{5}-\frac{21}{10}i)$$
$$-\frac{19}{5}$$
