$9x^3y\:+7\:x^3y$
$3x^5+25x^3+125x$
$x-4<-1$
$\lim_{x\to\infty}\left(\frac{\ln\left(1+x^2\right)}{\ln\left(1+e^x\right)}\right)$
$3x^2+5x+4=y$
$\frac{x^3-9^3}{x-9}$
$\frac{-x^3+8}{2x^2}$
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