$\frac{\left(2xy^2z^{-2}\right)^2}{\left(9x^{-1}yz^2\right)^{-1}}$
$20.49-25.65$
$\left(u^5-12\right)\left(u^5+12\right)$
$\int\frac{3x^3-7x+2}{x}dx$
$x^2-9y^2$
$8a^2-16a-90$
$\frac{2x+4}{6}\ge\frac{x}{6}-3$
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