# Chapter 3 - Section 3.2 - Exponential Functions - Exercise Set - Page 464: 92

$-7$

#### Work Step by Step

RECALL: $\ln{e^x} = x.$ Note that $\dfrac{1}{e^7}=e^{-7}$. This means that the given expression can be written as $\ln{e^{-7}}.$ Use the rule above to obtain $\ln{e^{-7}} = -7.$

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