$\frac{7x^3-9x^2+5x-3}{12x-3}$
$3\left(2a-7\right)+3\left(a+5\right)-1$
$\frac{-3x^3-18x^2+21x+180}{x+4}$
$\sqrt{24^2+7^2}$
$7-\left(-3+2+5-8+9\right)$
$\lim_{x\to+\infty}\left(1+e^{-2x}\right)^{-2x}$
$\frac{a^2-a-2}{a-1}$
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