Answer
$-1$
Work Step by Step
$\log \left( 3x+5\right) -\log \left( 2x+4\right) =0\Rightarrow \log \left( 3x+5\right) =\log \left( 2x+4\right) $
$\Rightarrow 3x+5=2x+4\Rightarrow x=-1$
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