$x^2+2x-\frac{8}{x^2}+9x+20$
$4x^2-12x+2$
$9x^2-72x+81$
$\int x^2+5\:dx$
$3x+5>x+7$
$\frac{\sqrt{y}}{4+\sqrt{y}}$
$21x^2-2x-3$
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