Applicare la formula: $x\left(a+b\right)$$=xa+xb$, dove $a=-\frac{1}{3}$, $b=2\cdot \left(\frac{4}{5}\right)^2$, $x=3$ e $a+b=-\frac{1}{3}+2\cdot \left(\frac{4}{5}\right)^2$

Applicare la formula: $ab$$=ab$, dove $ab=3\cdot 2\cdot \left(\frac{4}{5}\right)^2$, $a=3$ e $b=2$

Applicare la formula: $a^b$$=a^b$, dove $a=\frac{4}{5}$, $b=2$ e $a^b=\left(\frac{4}{5}\right)^2$

Combinazione di termini simili $3\cdot \left(-\frac{1}{3}\right)$ e $6\cdot \left(\frac{16}{25}\right)$