Consider 3^log₃x

First consider just the exponent: It can be translated as '3 to the power of something that makes 3 become x.'
Now consider the entire expression: 3 is being raised to that 'something' that makes 3 become x...
Consequently, the expression = x.

One way: 9 = 3^log₃9
Find another way.

Refer to previous hints.

One way: 7 = 7^??????