$14d-7-2d$
$\frac{160x^{-3}y^2}{-40x^2y}$
$\left(4+\sqrt[3]{-1000}\right)^3$
$\frac{2}{\sqrt{7+x}}$
$3^{-8}\cdot3^4$
$\left(x^2-3a^2\:y\right)^2$
$\frac{r^2}{2r^3}$
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