$3a^2-9$
$-3.6-1.9t+1.2+5.1$
$5-3.21$
$\frac{dy}{dx}\left(\frac{5-2xy}{x^2}\right)$
$15h-6-8+7h$
$\left(4a^2b+5a^6b^3\right)$
$\left(6x^6-3\right)\left(6x^6+6\right)$
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