$\frac{dy}{dz}=\frac{y}{z}$
$\frac{-9^3-9x^2-x}{x^2+9}$
$\lim_{x\to3}\left(\frac{x^2-x-6}{x^2+9}\right)$
$\left(5a+1\right)^2\left(a+3\right)^2$
$125m^4-20n^4$
$\left(2x^2-3x^2\right)\left(x^2+5x^3+5\right)$
$-3x^3+\frac{2}{1}$
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