$dr-2dx=0$
$10m+15n+20y$
$2,82\cdot745$
$\int500e^{-0.02t}dt$
$a^2-1=b$
$\int\frac{x-13}{x^2+x-6}dx$
$\frac{9a^4b^2\:-\:16a^2b^6}{3a^2b\:-\:4ab^3}$
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