$\frac{x^4-5x^2+4}{x+5}$
$x\frac{dy}{dx}+y=2y^{-2}$
$\left(2x^2\:+\:4x\:-\:3\right)\:\left(x^2\:-\:7x\:+\:1\right)$
$\left(-3\cdot7\right)+\frac{10}{5}$
$5n^2-20n+6=0$
$\left(-38\right)\:-\:\left(-32\right)$
$\frac{\frac{1}{x}}{x}$
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