$\lim_{x\to3}\left(\frac{3-x}{x}\right)$
$4x^3+4x^2-x-1$
$\frac{x^2+2}{x^2+2x}$
$x^2+110+180$
$\frac{1}{2}\int\left(6^{3x+4}\right)dx$
$\frac{-1^3-1}{-1^2}$
$152+b+226+c$
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