Answer
$-\dfrac {3}{2}$
Work Step by Step
$e^{3-x}=\left( e^{3}\right) ^{-x}\Rightarrow e^{3-x}=e^{-3x}\Rightarrow 3-x=-3x\Rightarrow 2x=-3\Rightarrow x=-\dfrac {3}{2}$
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