$x^2-9x-220$
$-\frac{1015}{-35}$
$\frac{x^5y^7}{x^2y^3}$
$\left(-x^2-3x+6\right)\left(-x^2-3x+6\right)$
$\lim_{x\to0}\frac{sin\left(2x\right)}{cos\left(3x\right)}$
$\lim_{x\to0}\left(\frac{arctan\left(2x\right)}{x^2}\right)$
$\left(\frac{3x-1}{2x-4}\right)+\left(\frac{4x}{3x-6}\right)-\left(\frac{x-4}{5x-10}\right)$
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