Applicare la formula: $a+\frac{b}{c}$$=\frac{b+ac}{c}$, dove $a=9a$, $b=-1$, $c=3b+10$, $a+b/c=9a+\frac{-1}{3b+10}$ e $b/c=\frac{-1}{3b+10}$

Applicare la formula: $\frac{a}{\frac{b}{c}}$$=\frac{ac}{b}$, dove $a=1$, $b=-1+9a\left(3b+10\right)$, $c=3b+10$, $a/b/c=\frac{1}{\frac{-1+9a\left(3b+10\right)}{3b+10}}$ e $b/c=\frac{-1+9a\left(3b+10\right)}{3b+10}$

Moltiplicare il termine singolo $a$ per ciascun termine del polinomio $\left(27b+90\right)$

Applicare la formula: $\left(\frac{a}{b}\right)^n$$=\frac{a^n}{b^n}$, dove $a=3b+10$, $b=-1+27ba+90a$ e $n=2$