$\frac{dy}{dx}\:\left(\frac{x-y}{y}\right)=\frac{x+y}{x}$
$\frac{dy}{dx}=\frac{2x-1}{3y^2}$
$\lim_{x\to\:\infty\:}\left(\frac{x}{x+1}\right)^{3x}$
$x^{2}-6x+9=7$
$\left(4-a\right)\left(6-a\right)$
$\frac{\left(32-8x\right)}{4}$
$\frac{4x^2-3x-2}{x+1}$
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