$x^2+13x+5$
$25z^3-2z^2-4z^3+8z^2-9+z$
$\frac{y+1}{y^3}dy=-xe^xdx$
$ax^4-ax^2$
$\lim_{x\to4}\left(\frac{2x^{2}-5x-12}{x-4}\right)$
$64b^4-36a^2$
$\frac{u}{-13}\:\:+\:221\:=\:205$
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