$6^{-8}\cdot6^5$
$21b-7$
$\left(x^3+4\right)\left(x^3-3\right)$
$\:xy-2x^2-y=3$
$\left(-\infty.-6\right)$
$\frac{5}{y+3}-\frac{4}{3y}=\frac{7}{y^2+3y}$
$\int\frac{-x}{5000}dx$
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