$9u-40\le-2\left(6-8u\right)$
$\frac{x^4-\:y^4}{x-y}$
$\frac{6^{14}}{6^8}$
$42=7r$
$49-y^4$
$\frac{dy}{dt}-3x\sqrt[2]{x^2+1}=0$
$\int15x^2e^{x^3}dx$
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