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

Applicare la formula: $\frac{\frac{a}{b}}{\frac{c}{f}}$$=\frac{af}{bc}$, dove $a=3x$, $b=7$, $a/b/c/f=\frac{\frac{3x}{7}}{\frac{x}{14}}$, $c=x$, $a/b=\frac{3x}{7}$, $f=14$ e $c/f=\frac{x}{14}$

Applicare la formula: $\frac{a}{a}$$=1$, dove $a=x$ e $a/a=\frac{3\cdot 14x}{7x}$