$\frac{x^2-2x+1}{x^2-2}$
$-\frac{1}{3}\left(3n-12\right)\:-\frac{7}{10}\left(5n-2\right)$
$\left(7m^3+2\right)-\left(7m^3-2\right)$
$\int x^3e^{-5}dx$
$\frac{x^2+5x+1}{x+3}$
$+\frac{133}{+19}$
$\left(\frac{1}{2}+a\right)\left(\frac{1}{2}-a\right)$
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