$a^2-8a-20=0$
$\frac{d}{dx}x^2-8xy+y^3$
$\lim_{x\to\infty}\left(\frac{x^5}{5^x}\right)$
$80+7.5$
$\left(6-n\right)^2$
$63a^4b-37a^3b^2+27a^2b^3$
$\frac{3}{2x+1}-\frac{2}{2x-1}-\frac{x+3}{4x^2-1}=0$
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