= [tex] \frac{4}{5} [/tex] - [tex] \frac{4}{5} [/tex] x ([tex] \frac{5}{4} [/tex] + 1 + [tex] \frac{2}{10} [/tex]) =
= [tex] \frac{4}{5} [/tex] - [tex] \frac{4}{5} [/tex] x ([tex] \frac{25+20+4}{20} [/tex]) =
= [tex] \frac{4}{5} [/tex] - [tex] \frac{4}{5} [/tex] x [tex] \frac{49}{20} [/tex] =
= [tex] \frac{4}{5} [/tex] - [tex] \frac{49}{25} [/tex] =
= [tex] \frac{20-49}{25} [/tex] =
= [tex] \frac{-29}{25} [/tex]
