$2c+3c$
$\frac{20}{x}-\frac{20}{x-2}=\frac{4}{x}$
$\frac{-4.8}{2}-3.8$
$\sqrt{9x^2-18+5}$
$\lim_{k\to9}\left(\frac{k^2-81}{\sqrt{k}-3}\right)$
$n2-8n-81$
$\frac{-2x^3+11x^2-20\:}{x^2+x-2}$
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