$f\left(x\right)=\frac{\left(x+1\right)^2\left(x+3\right)^3}{x^2-2x-3}$
$y=3lnx$
$64x^2+192x+144$
$x+y+\left(x-y+z\right)-\left(x+y-z\right)$
$\lim_{x\to9}\left(\frac{\frac{2}{3}\left|x-9\right|}{x-9}\right)$
$-18x^2-60x-50$
$\frac{\left(x-2\right)^2}{y^n+7}$
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