$\frac{x}{2x^{2\:}+5x+2x}$
$16c^3+20c^2$
$-x+2z+x+2y$
$\int_1^4\frac{s^4-8}{s^2}ds$
$4x^2+10x+6$
$\lim_{x\to0}\left(\frac{x}{x-2\sqrt{x}}\right)$
$x^2-14x-33=0$
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