$\frac{x^3+3x^2+55}{x+5}$
$1+x-x^2\:yz-x^3\:yz$
$\left(2x^2+3y^5\right)^2$
$\frac{dr}{dt}=\frac{r^2+r}{t}$
$4x+9<1$
$9r^2-4r+1$
$6x<15$
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