$2+3+20+30+16$
$x^2\left(2x+5\right)-y^2\left(2x+5\right)$
$\frac{2x-4}{x^2-4x+4}$
$\lim_{x\to\infty}\left(\frac{x^2lnx}{e^x}\right)$
$2m+3m^2-4m$
$7x^2yz-\frac{2}{3}xz^3-\frac{8}{2}y-\frac{6}{3}y-\frac{5}{3}xz^3+\frac{5}{2}xz^3$
$\left(7a^2\:+\:2b^3\right)^2\:$
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