Answer
$-\frac{1}{6} $
Work Step by Step
$-6sin^{-1}(3x)=\pi \Longrightarrow sin^{-1}(3x)=-\frac{\pi}{6} \Longrightarrow 3x=sin(-\frac{\pi}{6})=-\frac{1}{2} \Longrightarrow x=-\frac{1}{6} $
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