$ \sqrt{2^{3x} } = \sqrt[3]{2^{-(x+1)}} $
$ 2^ {\frac{3x}{2}} = 2^ {-\frac{x+1}{3}} $
$ \frac{3x}{2} = -\frac{x+1}{3} $
$ 9x = -2(x+1) $
$ 11 x = -2$
$ x = -\frac{2}{11}$
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