$\lim_{x\to4}\left(\frac{3x^3+6x^2-9x}{x^2-9}\right)$
$a+3ab$
$2abc^3+2abc^2-50abc-50ab$
$x\frac{dy}{dx}-2x^2=0$
$\left(4-x\right)^{-0.5}$
$50x-80y$
$\frac{x^{-5}}{x^{-6}}$
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