$\frac{d^3}{dx^3}\left(\frac{x^2}{5}-\frac{x^{-1}}{6}-\frac{3x^5}{20}\right)$
$3x^2-10x-25=0$
$a^2+4a-45$
$\sqrt{18^2}$
$\left(2n+1\right)^4$
$2\left(3\right)+3\left(3\right)$
$2^8-3^2$
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