$\frac{2}{x+1}=\frac{3}{x-1}1$
$x^2+12x+9$
$8x^4+2x^2-2$
$x^2-4-x-2$
$\frac{dy}{dx}=\frac{x^2+5}{2y}$
$\lim_{n\to\infty}\left(7-\frac{5}{n^2}+\frac{4}{n^5}\right)$
$-500+270-380-750+330$
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