## Precalculus: Concepts Through Functions, A Unit Circle Approach to Trigonometry (3rd Edition)

$x=3$
Use the rule power rule: $a^p=a^q$ . We can see that the base $a=7$ is same on both sides of the equation . So, the exponents will also be equal. This implies that $p=q$ Therefore, $7^x=7^3\implies x=3$