$\frac{x}{\sqrt{-1-4x^2-8x}}$
$\:-1+8-5\left(16-20\right)$
$6\left(d+5\right)$
$16+x=-1$
$-2x^3\left(5x+6\right)$
$6+\frac{24}{2}$
$-4x+8-x$
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