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5-131.
Consider 3log3x
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 = 3log39
Find another way.
Refer to previous hints.
One way: 7 = 7??????