$25x^215x$
$\frac{r^5-2r^6-r+1}{r^2-1}$
$\frac{x^{2}-7^{2}x^{2x}+1}{x^{3}-7x^{2}+7x+15}$
$x'=-2x+e^t$
$\int-\frac{2x}{\sqrt{1-4x^2}}dx$
$\csc^2x-4\cot x-2$
$\:w^2r^2\:-\:16$
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