$\frac{b}{-16}=5$
$8x=4x^2-1$
$x^2-x-2>0$
$2k^2+k-7=0$
$\frac{x^k}{2^k}$
$\frac{-4x^3+x^2-4}{x+1x-1}$
$\frac{dy}{dx}=\frac{3x}{7y}$
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