aiuto per risolvere questa espressione. grazie (frazioni e numeri con virgola)

An alternative method to that previously used is to transform fractions into decimal numbers.

[(0,3+4/5*0,35-0,4+7/2) : 0,92-1/5] : 9,5

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$\left[\left(0,3+\dfrac{4}{5}×0,35-0,4+\dfrac{7}{2}\right) : 0,92 -\dfrac{1}{5}\right] : 9,5=$

$=\left[\left(\dfrac{3}{10}+\dfrac{\cancel4^1}{\cancel5_1}×\dfrac{\cancel{35}^7}{\cancel{100}_{25}}-\dfrac{\cancel4^2}{\cancel{10}_5}+\dfrac{7}{2}\right) : \dfrac{\cancel{92}^{23}}{\cancel{100}_{25}} -\dfrac{1}{5}\right] : \dfrac{\cancel{95}^{19}}{\cancel{10}_2}=$

$=\left[\left(\dfrac{3}{10}+\dfrac{1}{1}×\dfrac{7}{25}-\dfrac{2}{5}+\dfrac{7}{2}\right) : \dfrac{23}{25} -\dfrac{1}{5}\right] : \dfrac{19}{2}=$

$=\left[\left(\dfrac{3}{10}+\dfrac{7}{25}-\dfrac{2}{5}+\dfrac{7}{2}\right) × \dfrac{25}{23} -\dfrac{1}{5}\right] × \dfrac{2}{19}=$

$=\left[\left(\dfrac{15+14-20+175}{50}\right) × \dfrac{25}{23} -\dfrac{1}{5}\right] × \dfrac{2}{19}=$

$=\left[\dfrac{\cancel{184}^8}{\cancel{50}_2} × \dfrac{\cancel{25}^1}{\cancel{23}_1} -\dfrac{1}{5}\right] × \dfrac{2}{19}=$

$=\left[\dfrac{\cancel8^4}{\cancel2_1} × \dfrac{1}{1} -\dfrac{1}{5}\right] × \dfrac{2}{19}=$

$=\left[\dfrac{4}{1} -\dfrac{1}{5}\right] × \dfrac{2}{19}=$

$=\left[\dfrac{20-1}{5}\right] × \dfrac{2}{19}=$

$=\dfrac{\cancel{19}^1}{5} × \dfrac{2}{\cancel{19}_1}=$

$= \dfrac{1}{5} × \dfrac{2}{1}=$

$= \dfrac{2}{5}$