Applicare la formula: $\frac{a^n}{a}$$=a^{\left(n-1\right)}$, dove $a^n/a=\frac{-\frac{7}{8}a^mb^n}{-\frac{3}{4}ab^2}$, $a^n=a^m$ e $n=m$

Applicare la formula: $\frac{a^m}{a^n}$$=a^{\left(m-n\right)}$, dove $a^n=b^2$, $a^m=b^n$, $a=b$, $a^m/a^n=\frac{-\frac{7}{8}a^{\left(m-1\right)}b^n}{-\frac{3}{4}b^2}$, $m=n$ e $n=2$

Applicare la formula: $\frac{\frac{a}{b}}{\frac{c}{f}}$$=\frac{af}{bc}$, dove $a=-7$, $b=8$, $a/b/c/f=\frac{-\frac{7}{8}a^{\left(m-1\right)}b^{\left(n-2\right)}}{-\frac{3}{4}}$, $c=-3$, $a/b=-\frac{7}{8}$, $f=4$ e $c/f=-\frac{3}{4}$