Applicare la formula: $x^a=b$$\to \left(x^a\right)^{inverse\left(a\right)}=b^{inverse\left(a\right)}$, dove $a=7$, $b=x^9$, $x^a=b=y^7=x^9$, $x=y$ e $x^a=y^7$

Applicare la formula: $\left(x^a\right)^b$$=x$, dove $a=7$, $b=1$, $x^a^b=\sqrt[7]{y^7}$, $x=y$ e $x^a=y^7$

Simplify $\sqrt[7]{x^9}$ using the power of a power property: $\left(a^m\right)^n=a^{m\cdot n}$. In the expression, $m$ equals $9$ and $n$ equals $\frac{1}{7}$

Applicare la formula: $\frac{a}{b}c$$=\frac{ca}{b}$, dove $a=1$, $b=7$, $c=9$, $a/b=\frac{1}{7}$ e $ca/b=9\cdot \left(\frac{1}{7}\right)$