$\frac{dy}{dx}=\frac{2x}{x-4z}$
$\left(12a^3b+6b^3c\right)\left(12a^3b-6b^3c\right)$
$4a^2-\:81y^4$
$ln\left(x+3\right)-ln4=-1$
$3x^2-108a^2$
$x-4\le-2x-9$
$\frac{y^{19}}{y^6}$
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