$$(\frac{\frac{1}{5}}{3\frac{4}{5}}\times19)\div5$$
$\frac{1}{5}=0.2$
$$\frac{\frac{5}{5\left(3\times 5+4\right)}\times 19}{5}$$
$$\frac{\frac{5}{5\left(15+4\right)}\times 19}{5}$$
$$\frac{\frac{5}{5\times 19}\times 19}{5}$$
$$\frac{\frac{5}{95}\times 19}{5}$$
$$\frac{\frac{1}{19}\times 19}{5}$$
$$\frac{1}{5}$$
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$\frac{1}{5} = 0.2$