Answer
$\dfrac{7x-23}{x+1}$
Work Step by Step
RECALL:
$\ln{a} = \ln{b} \longrightarrow a = b$
Use the rule above to obtain:
$\dfrac{7x-23}{x+1} = x-3$
Thus, the missing expression in the given statement is:
$\dfrac{7x-23}{x+1}$