$-500+100-300-400$
$\frac{16x^8-1}{2x^2+1}$
$ydy-7xdx=0$
$\lim_{x\to9}\left(\frac{\sqrt{x}-3}{x^2-81}\right)$
$\int\frac{3x-1}{x^2-1}dx$
$7a-12a$
$\frac{x^2-b^2}{x-b}$
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