$-9x^4-16x^3-7x^2-20x$
$x^3-4x+x^2$
$\int_1^{\infty}\left(\frac{\sqrt{1+\sqrt{x}}}{\sqrt{x}}\right)dx$
$\frac{k}{k^{-6}}$
$\frac{d}{dx}e^{x^5+2x}$
$\left(4a+6\right)\left(4a-8\right)$
$7ab^2+14bc+12ab^2+4bc$
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