Applicare la formula: $\frac{a^m}{a^n}$$=a^{\left(m-n\right)}$, dove $a^n=a^{\left(m+3\right)}$, $a^m=a^{\left(m+8\right)}$, $a^m/a^n=\frac{a^{\left(m+8\right)}}{a^{\left(m+3\right)}}$, $m=m+8$ e $n=m+3$

Applicare la formula: $-\left(a+b\right)$$=-a-b$, dove $a=m$, $b=3$, $-1.0=-1$ e $a+b=m+3$

Applicare la formula: $a+b$$=a+b$, dove $a=8$, $b=-3$ e $a+b=m+8-m-3$

Annullare i termini come $m$ e $-m$