$9b+8-2b$
$y^2+11y+1$
$\frac{d}{dx}\sqrt{x}+2e^x$
$\lim_{x\to\infty}\left(\frac{10x^2}{e^{\left(7x\right)}}\right)$
$x-2xy+x^2y+y=0$
$\lim_{x\to3}\left(\frac{x^2+2x-15}{x+5}\right)$
$2x^2-4x+5$
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