$\frac{dy}{dx}=8x^3+5$
$y\frac{dy}{dx}=x-2x^3$
$\frac{x}{x+2}=\frac{4}{x-3}$
$2^{10}\:+\:2^{30}$
$-x^2-4x-1$
$8x^{4\:}-30x^3+13x^2+18x-9$
$\frac{x^2-0.6x+0.08}{4x^2+2.4x+0.36}$
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