$x^2+9x+20=0$
$\lim_{x\to-\infty}\left(\frac{x^3}{e^{-x}}\right)$
$\frac{d}{dx}t^4-18t^3+25$
$x^3-6x^2+15x-14$
$9.x=3.123$
$\left(4x^4y^{-4}\right)^3$
$\left(2.4x+8\right)^2$
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