$\lim_{x\to\infty}\left(\frac{x^2+20}{x^3+17}\right)$
$-4z-3z$
$-2+\sqrt{9}-4$
$\log\left(6x+5\right)=-2$
$\int\frac{x^2-x}{x\left(x+1\right)}dx$
$3x-x^3-4x+5x^3+4x^2-6$
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