$169x^2+260xy+9x$
$\left(z-3\right)\left(z+7\right)$
$y'=2+2y+x+xy$
$5x-1\ge-2$
$\frac{1}{x+1}\:+\:\frac{2x}{x^2-1}\:-\:\frac{1}{x-1}$
$\frac{2x^3}{x^2+4}$
$x^2+12x-45\ge0$
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