Applicare la formula: $\frac{\frac{a}{b}}{\frac{c}{f}}$$=\frac{af}{bc}$, dove $a=-9t^{12}$, $b=7$, $a/b/c/f=\frac{\frac{-9t^{12}}{7}}{\frac{-t^9}{5}}$, $c=-t^9$, $a/b=\frac{-9t^{12}}{7}$, $f=5$ e $c/f=\frac{-t^9}{5}$

Applicare la formula: $\frac{a^m}{a^n}$$=a^{\left(m-n\right)}$, dove $a^n=t^9$, $a^m=t^{12}$, $a=t$, $a^m/a^n=\frac{-45t^{12}}{-7t^9}$, $m=12$ e $n=9$

Applicare la formula: $\frac{ab}{c}$$=\frac{a}{c}b$, dove $ab=-45t^{3}$, $a=-45$, $b=t^{3}$, $c=-7$ e $ab/c=\frac{-45t^{3}}{-7}$