$ydx=xdy$
$\frac{7}{x+2}+\frac{5}{x-2}$
$\lim_{x\to0}\left(\frac{e^{\frac{1}{x}}}{x^{-1}}\right)$
$\frac{-x^2+2}{x+5}$
$7\left(5-2\right)+5-3$
$\left(\frac{4}{x}\right)-3>\left(\frac{2}{x}\right)-7$
$\frac{\left(4x+8\right)\left(x^2-1\right)}{x-1}$
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