$4n+7-8n+5-3n^2$
$\left(\frac{x^2}{2}+1\right)^2$
$\lim_{w\to0}\:w^2\left(2w^6-3w^4\right)^{-1}$
$\left(x^2+2\:x\:y\right)y'+2y^2=-3xy$
$2\:log\:x\:-\:3\:log\:2$
$\frac{x^3-22x+15}{x+5}$
$12x^5+15x^4+-4x$
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