$-23-22-21$
$x^4-x^3-2x-4$
$\lim_{x\to0}\left(\sin\left(2x^3+4\pi\right)\right)$
$\frac{x^2-2x+3}{x+1}$
$x^{2-24x+144}$
$y^2+14y^2+49$
$a^2m+a^3n+ax^2$
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