$\log_x\left(-2x+15\right)=2$
$\frac{x^2+7x+17}{x+3}$
$\int\frac{1}{\sqrt{x^2+x+2}}dx$
$2x+3<3-x$
$\lim_{x\to3}\left(\frac{-2x^2+13x-21}{x-3}\right)$
$4a^2-\:9b^2\:c^2$
$b^2+10b+100$
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