$\frac{40m^3n^2-20m^2n^3}{20m^2n^2}$
$\lim_{x\to2}\frac{x\left(x^2+3x+2\right)}{x^2-x-6}$
$\frac{d}{dx}e^{y+x}=x-y$
$6x^4+21x^3+18x^2$
$-7:-1+2:-2-8.-4$
$r+r+r+r$
$e^{-5x}\frac{1}{1-12x}$
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