$x^2-9x+14>0$
$9x^2+18x+81$
$\frac{\left(x+3\right)+\left(x-1\right)}{\left(x+1\right)}$
$\lim_{x\to-2}\left(-x+1\right)$
$\frac{x^3-x+42}{x-7}$
$\int\left(\frac{12}{\sqrt{s}}\right)ds$
$-7a^2-28a-28$
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