$-12m+3n-4m-10m+5n-n$
$-5x^2+20x+60$
$\frac{2k^3k^3}{k^{-3}}$
$\int\frac{x^4-2x+5}{x}dx$
$8m^3-27$
$2\cdot3^3-3^2+15$
$\lim_{x\to-3}\left(\frac{x+2}{x^2+7x+12}\right)$
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