$\left(-9\right):\left(-1\right)+\left(-6\right):\left(3\right)-2-5\left(-1\right)$
$\frac{n^4}{9}+2mn+9m^2$
$-\sqrt{x^3}+\frac{1}{x^2}$
$27-x^3y^3$
$853-25$
$\frac{x-8}{7}=\frac{x-9}{8}$
$\int\:\frac{x}{x-5}dx$
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