$\frac{x}{-5}-5<2$
$\frac{9x+27}{x^2-4x-5}$
$\sqrt{a^2}\cdot b^2\cdot\sqrt{a^4}\cdot b$
$49x^6-36y^2$
$30^5$
$4x^3-42x^2+108x$
$\frac{dy}{dt}=\frac{t}{y-t^2y}$
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