$-x^2+8x+9$
$3\left(n-9\right)-2\left(n+4\right)=6n$
$-28-+18+35-16+-42$
$\lim_{x\to2}\left(x^2+\frac{1}{9}\right)\left(x-\frac{1}{3}\right)$
$\int\frac{5x-1}{x^2-x+2}dx$
$32-3.2$
$\int\frac{x^2-2}{x\left(x-2\right)\left(x-3\right)}dx$
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