$18:\left(5-11\right)-\left[\left(6-8\right):\left(-2\right)-5\right]$
$\frac{2}{5}\left(\frac{10}{3}x+\frac{1}{4}y-\frac{15}{2}\right)$
$6x^5+2x^4-10x$
$\frac{x^9}{x^3}$
$\int\frac{1}{\sqrt{144-x^2}}dx$
$9x^2-36xy-36y^2$
$n^{''\:}+2n^{'\:}+n=0$
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